CN108805293A - The more bit control systems and method of based superconductive quantum calculation - Google Patents
The more bit control systems and method of based superconductive quantum calculation Download PDFInfo
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- CN108805293A CN108805293A CN201810667137.0A CN201810667137A CN108805293A CN 108805293 A CN108805293 A CN 108805293A CN 201810667137 A CN201810667137 A CN 201810667137A CN 108805293 A CN108805293 A CN 108805293A
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Abstract
The application provides a kind of more bit control systems and method of based superconductive quantum calculation, and the method is by initial quantum state and initial microwave sequence to hand over frequency signal to export；According to more bit gates built in the friendship frequency signal handling received and export quantum state to be measured；To the quantum state to be measured and measure to obtain the intrinsic fidelity of current more bit gates；And according to the intrinsic fidelity calculate and generate optimization microwave sequence, and the optimization microwave sequence feedback is manipulated again to obtain the more bit gates of target.
Description
Technical field
This application involves Technique on Quantum Communication fields, are manipulated more particularly to a kind of more bits of based superconductive quantum calculation
System and method.
Background technology
Superconducting Quantum calculating is one of mainstream realization method of current quantum computer, it utilizes Josephson junction
The Quantum Properties of (Josephson junction) circuit are encoded, and manipulate these quantum ratios according to quantum mechanics rule
Special (Qubit).In this process, particularly critical to the manipulation of quantum bit, this is because the manipulation to quantum bit will be straight
Connect the speed of service and accuracy rate for influencing quantum computer, therefore, how quickly and accurately the manipulation of more bit gates is for reality
Existing programmable is of great significance.
It has been demonstrated at present, quantum universal logic gate group can be only made of a quantum door and classical two doors, existing
The mode of realization quantum multi-position door be broadly divided into and realize and be directly realized by indirectly.Realize the indirect mode of arbitrary more bit gates
It is to be divided into the quantum wire that multiple single-bit doors and dibit door are constituted.However this will expend more manipulation times,
It is this to realize more bits indirectly since quantum unit door and/or two door operations are there are certain error rate (fidelity is less than 1)
The mode of door will bring lower fidelity, and take more time.Therefore, the more bit gate (single- of single how to be realized
Shot multi-qubit gate) operation quantum calculation is had a very important significance.
Invention content
In view of the relevant issues of prior art described above, the application's is designed to provide a kind of based superconductive quantum meter
The more bit control systems and method calculated, the operation for solving the realization more bit gates of single.
In order to achieve the above objects and other related objects, the first aspect of the application provides a kind of based superconductive quantum calculation
More bit control systems, including：Microwave input module, Superconducting Quantum module, measurement module and feedback module.Wherein, institute
Microwave input module is stated to be used for initial quantum state and initial microwave sequence to hand over frequency signal to export；The Superconducting Quantum module is used
In more bit gates built in the friendship frequency signal handling according to reception and export quantum state to be measured；The measurement module is for connecing
It receives the quantum state to be measured and measures to obtain the intrinsic fidelity of current more bit gates；The feedback module is used for foundation
The intrinsic fidelity, which calculate, generates optimization microwave sequence, and the optimization microwave sequence feedback is inputted to the microwave
Module is manipulated again to obtain the more bit gates of target.
In the certain embodiments of the first aspect of the application, the microwave input module includes microwave device.
In the certain embodiments of the first aspect of the application, the friendship frequency signal of microwave input module output be through
Split the friendship frequency signal of Signal averaging processing in different time periods.
In the certain embodiments of the first aspect of the application, the Superconducting Quantum module includes co-planar waveguide resonance
Chamber, the co-planar waveguide resonant cavity include that the superconducting transmission of multiple cascaded structures is sub (Transmon), each superconducting transmission
Sub (Transmon) is made of Cooper pair box.
In the certain embodiments of the first aspect of the application, the Superconducting Quantum module includes co-planar waveguide resonance
Device.
In the certain embodiments of the first aspect of the application, the superconducting transmission of multiple cascaded structures is sub (Transmon)
It is coupled by bus and the co-planar waveguide resonant cavity.
In the certain embodiments of the first aspect of the application, the measurement module includes：Signal measurement unit and guarantor
True degree computing unit.Wherein, the signal measurement unit is for receiving the quantum state to be measured；The fidelity computing unit is used
In the intrinsic fidelity for carrying out current more bit gates to the quantum state to be measured by preset measurement method.
In the certain embodiments of the first aspect of the application, the preset measurement method is the throwing in the directions X-Y-Z
Shadow measures.
In the certain embodiments of the first aspect of the application, the preset measurement method is RB (Randomized
Benchmarking it) measures, tomoscan (Tomography) measures, door set tomoscan (Gate Set
Tomography it) measures or estimation error (Error Mitigation) measures.
In the certain embodiments of the first aspect of the application, the feedback module includes：Parameter optimization unit and anti-
Present unit, wherein the parameter optimization unit is for optimizing the initial microwave sequence according to the intrinsic fidelity
Output optimization microwave sequence after processing；The feedback unit is used to the optimization microwave sequence feedback inputting mould to the microwave
Block is manipulated again to obtain the more bit gates of target.
In the certain embodiments of the first aspect of the application, the feedback module further includes fidelity computing unit,
Intrinsic fidelity for carrying out current more bit gates to the quantum state to be measured by preset measurement method.
In the certain embodiments of the first aspect of the application, the parameter optimization unit using BFGS algorithms or
Global Search algorithms optimize processing to the initial microwave sequence.
In the certain embodiments of the first aspect of the application, more bits manipulation system of the based superconductive quantum calculation
System further includes Optimal Parameters generation module, described pre- for sending preset initial microwave sequence to the microwave input module
If initial microwave sequence be to be handled through pre-optimized.
The second aspect of the application provides a kind of more bit control methods of based superconductive quantum calculation, including following step
Suddenly：By initial quantum state and initial microwave sequence to hand over frequency signal to export；According to built in the friendship frequency signal handling received
More bit gates simultaneously export quantum state to be measured；To the quantum state to be measured and measure to obtain the intrinsic guarantor of current more bit gates
True degree；And according to the intrinsic fidelity calculate and generate optimization microwave sequence, and by the optimization microwave sequence feedback
It is manipulated again to obtain the more bit gates of target.
In the certain embodiments of the second aspect of the application, the friendship frequency signal is through splitting letter in different time periods
The friendship frequency signal of number overlap-add procedure.
In the certain embodiments of the second aspect of the application, more bit gates are the superconduction by multiple cascaded structures
Transmission sub (Transmon) is coupled composition by bus and a co-planar waveguide resonant cavity, and each superconducting transmission is sub
(Transmon) it is made of Cooper pair box.
In the certain embodiments of the second aspect of the application, the preset measurement method is the throwing in the directions X-Y-Z
Shadow measures.
In the certain embodiments of the second aspect of the application, the preset measurement method is RB (Randomized
Benchmarking it) measures, tomoscan (Tomography) measures, door set tomoscan (Gate Set
Tomography it) measures or estimation error (Error Mitigation) measures.
It is described to carry out calculating generation according to the intrinsic fidelity in the certain embodiments of the second aspect of the application
The step of optimizing microwave sequence includes being exported after optimizing processing to the initial microwave sequence according to the intrinsic fidelity
Optimize microwave sequence in the certain embodiments of the second aspect of the application, the parameter optimization unit using BFGS algorithms or
Global Search algorithms optimize processing to the initial microwave sequence.
In the certain embodiments of the second aspect of the application, the method further includes generating preset initial microwave sequence
The step of row, the preset initial microwave sequence is handled through pre-optimized.
As described above, the more bit control systems and method of the application based superconductive quantum calculation, humorous using co-planar waveguide
Multiple superconducting transmissions (Transmon) are coupled together by module of shaking, and by simple microwave device to these quantum bits
It is manipulated, while feedback data and being optimized according to design scheme, obtained optimum control (Optimal Control) and join
Number realizes the more bit door operations of single.Technical solution provided by the present application has expansibility high, and fidelity is high, the operating time
Short advantage, application scenarios are universal, and cost is relatively low, and Superconducting Quantum, which is calculated, has very strong practical value.
Description of the drawings
Fig. 1 is shown as the functional block diagram of more bit control systems of the based superconductive quantum calculation of the application.
Fig. 2 is shown as the signal of more bit control systems of the based superconductive quantum calculation of the application in one embodiment
Figure.
Fig. 3 is shown as the signal of more bit control systems of the based superconductive quantum calculation of the application in another embodiment
Figure.
Fig. 4 is shown as signal of the more bit control systems of the based superconductive quantum calculation of the application in another embodiment
Figure.
Fig. 5 is shown as the flow of more bit control methods of the based superconductive quantum calculation of the application in one embodiment and shows
It is intended to.
Fig. 6 is shown as the flow of more bit control methods of the based superconductive quantum calculation of the application in another embodiment
Schematic diagram.
Specific implementation mode
Illustrate that presently filed embodiment, those skilled in the art can be by this explanations by particular specific embodiment below
Content disclosed by book understands other advantages and effect of the application easily.
In described below, refer to the attached drawing, attached drawing describes several embodiments of the application.It should be appreciated that also can be used
Other embodiment, and can be carried out without departing substantially from spirit and scope mechanical composition, structure, electrically with
And operational change.Following detailed description should not be considered limiting, and the range of embodiments herein
Only limited by the claims for the patent announced.
Term used herein is merely to describe specific embodiment, and be not intended to limit the application.Space correlation
Term, such as "upper", "lower", "left", "right", " following ", " lower section ", " lower part ", " top ", " top " etc., can make in the text
With the relationship in order to an elements or features and another elements or features shown in definition graph.In addition, though in some realities
Term first, second etc. are used for describing quantum state herein in example, but these quantum states should not be limited by these terms.
These terms are only used for distinguishing a quantum state with another quantum state.For example, the first test quantum state can be claimed
Make the second test quantum state, and similarly, the second test quantum state can be referred to as the first test quantum state, without departing from each
The range of kind described embodiment.First test quantum state and test quantum state be description one test quantum state, but
It is unless context otherwise explicitly points out, otherwise they are not the same test quantum states.Similar situation further includes
Third tests quantum state and the 4th test quantum state.
Furthermore as used in herein, singulative " one ", "one" and "the" are intended to also include plural number shape
Formula, unless there is opposite instruction in context.It will be further understood that term " comprising ", " comprising " show that there are the spies
Sign, step, operation, element, component, project, type, and/or group, but it is not excluded for other one or more features, step, behaviour
Presence, appearance or the addition of work, element, component, project, type, and/or group.Term "or" used herein and "and/or" quilt
It is construed to inclusive, or means any one or any combinations.Therefore, " A, B or C " or " A, B and/or C " mean " with
Descend any one：A；B；C；A and B；A and C；B and C；A, B and C ".Only when element, function, step or the combination of operation are in certain sides
When inherently mutually exclusive under formula, it just will appear the exception of this definition.
Quickly accurate more bit gates manipulations are of great significance for realizing programmable, and realize and compare more
The physical basis of Te Men manipulations is to prepare the quantum unit to intercouple.In Superconducting Quantum calculating, superconducting transmission is used
(Transmon) quantum bit is built as basic quantum unit, superconducting transmission (Transmon) is also in current superconduction system
One of highest physical unit of fidelity highest, Modulatory character.In addition, how that these superconducting transmissions (Transmon) are mutual
It is also an important problem to be coupled together.
It should be strongly noted that since Transmon is the physics list for constituting quantum bit in Superconducting Quantum calculating
, Transmon is referred to as superconducting transmission in this application, and in relevant technical literature, Transmon is also referred to as
Superconductive quantum bit or superconduction charge or superconducting charge qubits, these titles are represented by described herein
Superconducting transmission (Transmon).
The quantum wire that the realization that Universal Quantum calculates is constituted based on Hi-Fi quantum door, wherein quantum multi-position door have
It plays a very important role.The realization of Quantum Error Correcting Codes needs to act on the multi-position door of at least three quantum bit, such as Toffoli
Door (Toffoli, or controlled-controlled-NOT gate, also referred to as CCNOT gate or " control-control-is non-"
Door), Toffoli similarly have highly important effect in reversible quantum calculation.Existing realization quantum multi-position door
Mode, which is broadly divided into, to be realized and is directly realized by indirectly.Wherein, the mode realized indirectly is to be divided into multiple quantum single-bits
The quantum wire that door and dibit door are constituted is realized (refering to DOI:10.1038/nature10786), however this will be expended more
Time, and bring higher error rate；It is directly realized by quantum multi-position door and is also referred to as the more bit gates of single, currently existing scheme has：
The different energy levels that sub (Transmon) coupled system of superconducting transmission is distinguished by the microwave signal that manipulates containing when, realize more bits
Door is (refering to DOI:https://doi.org/10.1103/PhysRevA.87.022309)；Convert microwave signal to Piecewise Constant
Number signal manipulates (refering to DOI multidigit quantum bit:10.1103/PhysRevB.85.054504).
Have some researchs about more bit gate implementations at present, however the Hi-Fi more bits of general quantum
Door manipulation is not yet effectively realized.As previously mentioned, the side by the way that more bit gates to be split as to single-bit door and the combination of dibit door
Formula will expend more manipulation times, and bring lower fidelity, hence it is imperative that list can be directly realized by by seeking one kind
The scheme of secondary more bit gate manipulations.
About the realization of the more bit gates of single, have respectively just as the two kinds of representative implementations mentioned in aforementioned
From defect.For the scheme of direct control system energy level, when Transmon Fourier Series expansion techniques are complex, structure manipulates when containing
Microwave signal difficulty will rise therewith, and with it is this can level conversion control mode, have when realizing arbitrary more bit gates
Higher difficulty, expansibility are poor；For the scheme of optimizing fractional constant amplitude control signal, fail that leakage is effectively avoided to miss
Poor (leakage error), will bring certain influence to the fidelity of more bit gates.Based on this, the application proposes that one kind is based on
More bit control systems that Superconducting Quantum calculates can be used within the different times range such as 200ns, 150ns or 100ns quickly
Manipulation of the ground single to more bit gates (single-shot multi-qubit gate).
Referring to Fig. 1, being shown as the functional block diagram of more bit control systems of the based superconductive quantum calculation of the application, such as
Shown in figure, more bit control systems of the based superconductive quantum calculation include：Microwave input module 11, Superconducting Quantum module
12, measurement module 13 and feedback module 14.The microwave input module 11 is by initial quantum state and initial microwave sequence to hand over
Frequency signal is exported to the Superconducting Quantum module 12；The Superconducting Quantum module 12 is according in the friendship frequency signal handling of reception
More bit gates for setting simultaneously export quantum state to be measured to the measurement module 13, and the measurement module 13 receives the quantum state to be measured
And it measures to obtain the intrinsic fidelity of current more bit gates；The feedback module 14 is carried out according to the intrinsic fidelity
It calculates and generates optimization microwave sequence, and the optimization microwave sequence feedback is manipulated again to the microwave input module 11
To obtain the more bit gates of target, experience is repeated several times through above procedure, finally reaches optimal modulation effect, and then realize single
More bit door operations.
Referring to Fig. 2, being shown as more bit control systems of the based superconductive quantum calculation of the application in one embodiment
Schematic diagram, as shown, the microwave input module 11 be used for by initial quantum state and initial microwave sequence to hand over frequency signal
Output；In one embodiment, the microwave input module 11 includes microwave device, for generating the microwave signal for handing over frequency form,
The microwave device can pass through commercial microwave device realization, for example, microwave generator.
In the present embodiment, the friendship frequency signal that the microwave input module 11 exports is through splitting signal in different time periods
The friendship frequency signal of overlap-add procedure, in embodiment, the friendship frequency signal through splitting Signal averaging processing in different time periods is
The superposition of DRAG signals in different time periods so that built-in all bit gates are by same friendship frequency in the Superconducting Quantum module 12
The modulation of signal avoids channel interference when to different bit gates individually modulate.Due to by signal according to it is different when
Between section be divided into segmentation DRAG signals combination, also significantly reduce lobe error (leakage error).
The Superconducting Quantum module 12 is used for more bit gates built according to the friendship frequency signal handling received, and output waits for
Quantum state is surveyed, the quantum state to be measured is by the initial initial quantum state to input by currently handing over built in frequency signal handling
The another form of quantum state exported after more bit gates, in various embodiments, the quantum state to be measured can also be claimed
For test quantum state or prepare quantum state etc..The more bit gate U of target of the quantum state corresponding modulating to be measuredt, wherein t tables
Show current time.In embodiment, the Superconducting Quantum module 12 includes for example, co-planar waveguide resonator (coplanar
Waveguide resonator) co-planar waveguide (Coplanar Waveguide, CPW) resonant cavity 121, the co-planar waveguide
Resonant cavity 121 is in series with superconducting transmission (Transmon) 122 of multiple cascaded structures, each superconducting transmission
(Transmon) 122 box is made of cooper (Cooper), the superconducting transmission of multiple cascaded structures is sub (Transmon)
122 are coupled by bus and the co-planar waveguide resonant cavity 121, i.e. Bus Coupling schemes.
In embodiment provided by the present application, the Bus Coupling schemes are superconducting transmission that will be prepared
(Transmon) 122 are coupled to by row arrangement in the co-planar waveguide resonant cavity 121 of high-quality-factor, co-planar waveguide resonant cavity 121
In photon can induce 122 mutual long-range close coupling of superconducting transmission (Transmon), to construct superconduction amount
The physics underlying model of sub- computer.
For the measurement module 13 for receiving the quantum state to be measured and measuring, the purpose of measurement is to be worked as
The intrinsic fidelity of preceding more bit gates, the measurement module 13 are the signal measurement end being made of multiple measuring apparatus and equipment.
In the present embodiment, the measurement module 13 includes：Signal measurement unit 131 and fidelity computing unit 132.
The signal measurement unit 131 is for receiving the quantum state to be measured；The fidelity computing unit 132 is for leading to
The intrinsic fidelity that preset measurement method carries out the quantum state to be measured current more bit gates is crossed, i.e., is currently handed under frequency signal
More bit gates intrinsic fidelity.In the present embodiment, the preset measurement method is X-direction, Y-direction and Z-direction three
Projection measurement on a direction.
In certain embodiments, the preset measurement method can be that RB (Randomized Benchmarking) is surveyed
Amount, tomoscan (Tomography) measurement (please refer to D'Ariano, et al.Physical review letters
86.19(2001):4195.), door set tomoscan (Gate Set Tomography) measurement (please refers to Greenbaum, et
al.arXiv preprint arXiv:1509.02921 (2015)) or estimation error (Error Mitigation) measurement
(please refer to Temme, Kristan et al.Physical review letters 119.18 (2017):180509.) etc.,
In the present embodiment, preferentially RB (Randomized Benchmarking) is selected to measure, be detailed later.
The feedback module 14, which is used to according to the intrinsic fidelity calculate, generates optimization microwave sequence, and will be described
Optimization microwave sequence feedback is manipulated again to the microwave input module 11 to obtain the more bit gates of target.In the present embodiment
In, the feedback module 14 includes：Parameter optimization unit 141 and feedback unit 142.
The parameter optimization unit 141 is used to optimize place to the initial microwave sequence according to the intrinsic fidelity
Output optimization microwave sequence after reason；The feedback unit 142 is used to input the optimization microwave sequence feedback to the microwave
Module 11 is manipulated again to obtain the more bit gates of target.In some embodiments, the parameter optimization unit 141 utilizes
BFGS algorithms (i.e. Broyden-Fletcher-Goldfarb-Shanno, abbreviation BFGS) or Global Search algorithms are to institute
It states initial microwave sequence and optimizes processing, wherein Global Search algorithms are realized by MATLAB software systems.At this
In embodiment, preferably BFGS algorithms is selected to optimize processing to the initial microwave sequence.
In another embodiment, the feedback module 14 further includes fidelity computing unit 143, i.e., the described fidelity
Computing unit 143 is a part for feedback module 14.The fidelity computing unit 143 is used to pass through preset measurement method pair
The quantum state to be measured carries out the intrinsic fidelity of current more bit gates, in as shown in figure 3, Fig. 3 be shown as the application based on
The schematic diagram of more bit control systems that Superconducting Quantum calculates in another embodiment.
In concrete implementation mode, the feedback module 14 includes the software and hardware in computer equipment, can be such as
The computer for being mounted with the computer program of each unit function in 14 function of herein described feedback module or feedback module 14 comes
It realizes, the computer includes but not limited to server, desktop computer or laptop etc..
In embodiment, the application will carry out design system framework by the Hamiltonian of more bit control systems, that is, pass through
Han Midun amounts develop to realize the design to system.The Hamiltonian is the energy operator of system, is a description system
The operator of gross energy, is indicated with H, then the Hamiltonian of more bit control systems is described as：H=H0+Hd+Hc。
Wherein, H0It is considered as superconducting transmission (Transmon) Hamiltonian of itself in system；
Wherein, i is expressed as i-th of superconducting transmission, and ω is expressed as the sub- respective frequencies of superconducting transmission, σzThe Pauli being expressed as on the directions z
Operator.Sub (Transmon) Hamiltonian H of of the superconducting transmission itself0It is fixed.
HdThe Hamiltonian being considered as under the friendship frequency signal modulation,Its
In, i is expressed as i-th of friendship frequency signal；Ω is expressed as handing over frequency signal amplitude, σxThe Pauli operators being expressed as on the directions x, σyIt indicates
For the Pauli operators on the directions y.Wherein,WithIt is expressed as handing over frequency signal, the Hamiltonian HdIt is adjustable or modulation
, the application is formally by adjusting or modulating the Hamiltonian HdTo realize the manipulation of more bit gates.
HcThe Hamiltonian to intercouple between superconducting transmission (Transmon) can be regarded as, provided herein
In embodiment, the Hamiltonian H that intercouples between the superconducting transmission (Transmon)cIt is also fixed, in the application
An embodiment in, using X-Y types couple, that is, to coupling Hamiltonian approximation arrive second order, only reservation X-Y between coupling, suddenly
Coupling between slightly Z-Z；
Then
Wherein, JijThe stiffness of coupling being expressed as between i-th and j-th of superconducting transmission.
In this application, adjust or modulate the Hamiltonian H by the friendship frequency signald, i.e., the described friendship frequency signalWithOnly act on HdOn, superconducting transmission according to multiple cascaded structures in the Superconducting Quantum module 12
(Transmon) it is modulated by same signal, thereforeIn view of in specific implementation process, superconduction passes
Defeated son (Transmon) prepares defect that may be present, inevitably will produce lobe error during manipulation
(leakage error), the generation of lobe error are usually to be regarded as two-level energy system because of Qubit, however actual superconduction passes
Defeated son (Transmon) has more energy levels, when it is transitted on non-computer ground level, just produces lobe error.
DRAG method in optimal controls are used in embodiment provided by the present application, the description as described in DRAG method in optimal controls can be with
Refering to DOI:10.1103/PhysRevA.82.040305(Optimized driving of superconducting
artificial atoms for improved single-qubit gates).In embodiment provided by the present application, such as
It is realized in time range in 200ns or 150ns, by DRAG control methods by the friendship frequency signal such as with 10ns or 20ns
The stacking pattern that signal is split into for unit, to determine the frequency for handing over frequency signal.
The DRAG method in optimal controls are expressed asWherein, A, B
It is undetermined parameter, the friendship frequency signal can be represented as Ω (t)=Ωx(t)cos(ωdt)+Ωy(t)sin(ωdT), it acts on
Time range be the σ of -2 σ~2, wherein ωdTo hand over the frequency of frequency signal；DRAG control methods can largely reduce leakage
Error.In the present embodiment, frequency signal will be handed over to be divided into DRAG signals in different time periods, i.e. Ωx,n(An, t) and Ωy,n(Bn, t),
N=1,2 ..., N, and 4 σ of action time per segment signal is remained unchanged (in time range -2 σ~2 σ acted on).Initial feelings
Under condition, the microwave input module 11 will generate M group argument sequences { (A at randomn,Bn)}1,{(An,Bn)}2,…,{(An,Bn)}M,
And it will be imparted to the Superconducting Quantum module 12.It in another embodiment, can also be by feedback module 14 under initial situation
One group of random initial parameter sequence is generated in advance, and is transmitted to the microwave input module 11.
During concrete implementation, the different period can be set according to specific performance, than
As to be set in the range of 150ns, the friendship frequency signal is such as split into letter as unit of 10ns by DRAG control methods
Number stacking pattern, then the microwave input module 11 is by the 15 of the random external Optimal Parameters equipment generation for generating or receiving
Group argument sequence { (An,Bn)}1,{(An,Bn)}2,…,{(An,Bn)}15, i.e. n=1,2 ... ... 15.However, it is not limited to this,
It can be under different implementation environments or implementation state, when the DRAG control methods being used to be overlapped processing to the friendship frequency signal
It uses and splits different time sections and the different frequencies with the determination friendship frequency signal for splitting unit.
The signal measurement unit 131 is for receiving the quantum state to be measured and being waited for described by preset measurement method
The intrinsic fidelity that quantum state carries out current more bit gates is surveyed, i.e., currently hands over the intrinsic fidelity of more bit gates under frequency signal.
In the present embodiment, the preset measurement method is X-direction, the projection measurement on three directions of Y-direction and Z-direction, such as
The measurement module 13 measures the more bit gates of single under current control signal using the method for Randomized Benchmarking
UtIntrinsic fidelity (intrinsic fidelity, i.e., fidelity neglecting decoherence), it is described
Intrinsic fidelity byIt indicates, i.e.,Wherein, UidealThe single being expressed as in the application is more
Bit gate, ρ are expressed as initial input quantum state.
In the case of 4 σ of Setting signal action time and frequency, for determining argument sequence { (An,Bn), it can obtain
Obtain the intrinsic fidelity of currently more bit operatingsI.e. with the degree of closeness of the more bit gates of target.In the present embodiment, described anti-
It presents module 14 and is obtaining M group argument sequences { (An,Bn)}1,{(An,Bn)}2,…,{(An,Bn)}MCorresponding intrinsic fidelityAfterwards, using the BFGS algorithms to object function, i.e., intrinsic fidelity
It optimizes, to obtain corresponding argument sequence under optimum control, thus just realizes the design of the more bit gates of arbitrarily quantum.
For be expanded on further the application based superconductive quantum calculation more bit control systems principle and effect, at one
In embodiment, the more bits manipulation for the based superconductive quantum calculation realized by system described herein is, for example, following step
Suddenly：
In physics bottom, the superconducting transmission (Transmon) 122 for multiple cascaded structures is passed through into above-mentioned Bus
Coupling schemes are coupling in 121 on the co-planar waveguide resonant cavity of co-planar waveguide resonator, and each superconducting transmission is sub
(Transmon) a kind of quantum state, for example, ground state are prepared into：It will be ground state to enable the microwave input module 11：
Initial quantum state and for example, M groups argument sequence { (An,Bn)}1,{(An,Bn)}2..., { (An, Bn)}MInitial microwave sequence
To hand over frequency signalForm export to the Superconducting Quantum module
12；The Superconducting Quantum module 12 is by the initial initial quantum state to input by currently handing over more comparing built in frequency signal handling
The quantum state to be measured that spy exports behind the door, i.e., described more bit gates and output according to built in the friendship frequency signal handling received wait for
Quantum state is surveyed to the measurement module 13, the measurement module 13 utilizes for example, survey of Randomized Benchmarking
The current fidelity for handing over more bit gates under frequency signal of amount method measurement, that is, traversal muliti-qubit are corresponding
CliffordnIt is operated in group, and carries out its inverse operation, i.e.,And average to it after traversing all operations,
And then the intrinsic fidelity of current more bit gates can be obtainedThen, the BFGS is recycled
Algorithm is to object function, i.e., intrinsic fidelityIt optimizes, the result of optimization is provided later
To feedback module 14, the feedback module 14, which according to the intrinsic fidelity calculate, generates optimization microwave sequence, and by institute
Optimization microwave sequence feedback is stated to be manipulated again to obtain the more bit gates of target, through the above mistake to the microwave input module 11
Input, optimization, feedback procedure is repeated several times several times in experience by journey, finally provides optimal control parameter sequence { (An,
Bn)}optimal, optimal modulation effect is finally reached, and then realize the more bit door operations of single.
Referring to Fig. 4, being shown as more bit control systems of the based superconductive quantum calculation of the application in another embodiment
Schematic diagram, as shown, in another embodiment, more bit control systems of the based superconductive quantum calculation further include optimization
Parameter generation module, Optimal Parameters generation module is for generating preset initial microwave sequence to the microwave input module 11, institute
It is the beginning microwave sequence samples for being handled through pre-optimized, and then can controlling initial input to state and generate preset initial microwave sequence,
And it is further ensured that the Accuracy and high efficiency of operation.In the embodiment shown in fig. 3, the Optimal Parameters generation module is initial
In the case of generate M group argument sequences { (A at randomn, Bn)}1, { (An, Bn)}2..., { (An, Bn)}M, and it is defeated to will be imparted to the microwave
Enter module 11.To enable the microwave input module 11 to hand over frequency signal
It exports and built-in more bit gates is manipulated to the Superconducting Quantum module 12.
More bit control systems of the application based superconductive quantum calculation use co-planar waveguide resonance modules by multiple superconductions
Transmission sub (Transmon) is coupled together, and is manipulated to these quantum bits by simple microwave device, while anti-
Feedback data are simultaneously optimized according to design scheme, obtain optimum control (Optimal Control) parameter, realize the more bits of single
Door operation.Technical solution provided by the present application has expansibility high, and fidelity is high, operating time short advantage, application scenarios
Generally, and cost is relatively low.
The application also provides a kind of more bit control methods of based superconductive quantum calculation, uses co-planar waveguide resonance modules
Multiple superconducting transmissions (Transmon) are coupled together, and these quantum bits are grasped by simple microwave device
Control, while feedback data and being optimized according to design scheme, optimum control (Optimal Control) parameter is obtained, is realized
The more bit door operations of single thereby account for as previously described by the way that more bit gates are split as single-bit door and the combination of dibit door
Mode will expend more manipulation times, and bring lower fidelity.
Referring to Fig. 5, being shown as more bit control methods of the based superconductive quantum calculation of the application in one embodiment
Flow diagram, as shown, more bit control methods of the based superconductive quantum calculation include the following steps：
In step s 11, by initial quantum state and initial microwave sequence to hand over frequency signal to export；It in embodiment, will be first
Beginning quantum state and initial microwave sequence the step of handing over frequency signal to export by a microwave device can be realized, the microwave dress
Setting can be realized by commercial microwave device, for example, microwave generator etc..
In the present embodiment, the friendship frequency signal of the output is the friendship frequency through splitting Signal averaging processing in different time periods
Signal, in embodiment, the friendship frequency signal through splitting Signal averaging processing in different time periods is in different time periods
The superposition of DRAG signals so that all bit gates are modulated by same friendship frequency signal, are avoided and are carried out individually to different bit gates
Channel interference when modulation.It is also very big due to the combination for being segmented DRAG signals for being divided into signal according to the different periods
Degree reduces lobe error (leakage error).
In step s 12, according to receive the friendship frequency signal handling built in more bit gates and export quantum state to be measured；
In embodiment, more bit gates are placed in a Superconducting Quantum module or Superconducting Quantum device, the Superconducting Quantum module
Or the physics underlying model framework that Superconducting Quantum device is Superconducting Quantum computer,
The quantum state to be measured is by the initial initial quantum state to input by currently handing over built in frequency signal handling
The another form of quantum state exported after more bit gates, in various embodiments, the quantum state to be measured can also be claimed
For test quantum state or prepare quantum state etc..The more bit gate U of target of the quantum state corresponding modulating to be measuredt, wherein t tables
Show current time.In embodiment, the Superconducting Quantum module or Superconducting Quantum device include for example, co-planar waveguide resonator
Co-planar waveguide (Coplanar Waveguide, the CPW) resonant cavity of (coplanar waveguide resonator), it is described total
Face waveguide resonant cavity includes that the superconducting transmission of multiple cascaded structures is sub (Transmon), each superconducting transmission
(Transmon) box is made of cooper (Cooper), the superconducting transmission (Transmon) of multiple cascaded structures passes through
Bus is coupled with the co-planar waveguide resonant cavity, i.e. Bus Coupling schemes.
The Transmon is the physical unit that quantum bit is constituted in Superconducting Quantum calculating, in this application
Transmon is referred to as superconducting transmission, and in relevant technical literature, Transmon is also referred to as superconductive quantum bit,
Or superconduction charge or superconducting charge qubits, these titles are represented by superconducting transmission described herein
(Transmon)。
In embodiment provided by the present application, the Bus Coupling schemes are superconducting transmission that will be prepared
(Transmon) it is coupled in the co-planar waveguide resonant cavity of high-quality-factor by row arrangement, the photon in co-planar waveguide resonant cavity can
With the long-range close coupling for inducing superconducting transmission (Transmon) mutual, to construct the physics of Superconducting Quantum computer
Underlying model.
In step s 13, it to the quantum state to be measured and measures to obtain the intrinsic fidelity of current more bit gates；
In embodiment, it to the quantum state to be measured and is measured by measuring device or measuring apparatus, receives the quantum to be measured
State and the purpose measured are to obtain the intrinsic fidelity of current more bit gates, and the measurement module is by multiple measurements
The signal measurement end that equipment and equipment are constituted.
The intrinsic fidelity of current more bit gates is carried out to the quantum state to be measured by preset measurement method, i.e., currently
Hand over the intrinsic fidelity of more bit gates under frequency signal.In the present embodiment, the preset measurement method is X-direction, the side Y
To and three directions of Z-direction on projection measurement.In certain embodiments, the preset measurement method can be RB
(Randomized Benchmarking) is measured, and tomoscan (Tomography) measurement (please refers to D'Ariano, et
al.Physical review letters 86.19(2001):4195.), door set tomoscan (Gate Set
Tomography it) measures and (please refers to Greenbaum, et al.arXiv preprint arXiv:1509.02921
(2015)) or estimation error (Error Mitigation) measurement (please refer to Temme, Kristan et
al.Physical review letters 119.18(2017):180509.) etc., in the present embodiment, preferentially select RB
(Randomized Benchmarking) is measured, and is detailed later.
In step S14, carry out calculating generation optimization microwave sequence according to the intrinsic fidelity, and the optimization is micro-
Wave train feedback is manipulated again.In some embodiments, BFGS algorithms (i.e. Broyden-Fletcher- is utilized
Goldfarb-Shanno, abbreviation BFGS) or Global Search algorithms processing is optimized to the initial microwave sequence,
In, Global Search algorithms are realized by MATLAB software systems.In the present embodiment, preferably select BFGS algorithms to institute
It states initial microwave sequence and optimizes processing.
In step S15, judge to obtain more bit gates whether the more bit gates of target, that is, judge the optimization microwave obtained
Sequence whether optimal control parameter sequence { (An,Bn)}optimal, if it is, the step of terminating the method, if it is not, then returning
In step S11, by the optimization microwave sequence feedback to microwave device, experience multiplicating is inputted through above procedure, is optimized,
Feedback procedure several times, finally provides optimal control parameter sequence { (An,Bn)}optimal, optimal modulation effect is finally reached, into
And realize the more bit door operations of single.
In concrete implementation mode, the feedback operation can by the computer equipment comprising software and hardware come
It realizes, can for example be mounted with the computer of the computer program of herein described feedback function to realize, the computer includes
But be not limited to server, desktop computer or laptop etc..
In embodiment, more bit control methods of the application based superconductive quantum calculation by the evolution of Han Midun amounts come
It realizes.The Hamiltonian is the energy operator of system, is the operator of a description system gross energy, is indicated with H, then described more
The Hamiltonian of bit control system is described as：H=H0+Hd+Hc。
Wherein, H0It is considered as sub (Transmon) Hamiltonian of of superconducting transmission itself；Wherein, i
It is expressed as i-th of superconducting transmission；ω is expressed as the sub- respective frequencies of superconducting transmission, σzThe Pauli operators being expressed as on the directions z.
Sub (Transmon) Hamiltonian H of of the superconducting transmission itself0It is fixed.
HdThe Hamiltonian being considered as under the friendship frequency signal modulation,Its
In, i is expressed as i-th of friendship frequency signal；Ω is expressed as handing over frequency signal amplitude, σxThe Pauli operators being expressed as on the directions x, σyIt indicates
For the Pauli operators on the directions y.Wherein,WithIt is expressed as handing over frequency signal, the Hamiltonian HdIt is adjustable or modulation
, the application is formally by adjusting or modulating the Hamiltonian HdTo realize the manipulation of more bit gates.
HcThe Hamiltonian to intercouple between superconducting transmission (Transmon) can be regarded as, provided herein
In embodiment, the Hamiltonian H that intercouples between the superconducting transmission (Transmon)cIt is also fixed, in the application
An embodiment in, using X-Y types couple, that is, to coupling Hamiltonian approximation arrive second order, only reservation X-Y between coupling, suddenly
Coupling between slightly Z-Z；
Then
Wherein, JijThe stiffness of coupling being expressed as between i-th and j-th of superconducting transmission.
In this application, adjust or modulate the Hamiltonian H by the friendship frequency signald, i.e., the described friendship frequency signalWithOnly act on HdOn, superconducting transmission according to multiple cascaded structures in the Superconducting Quantum device
(Transmon) it is modulated by same signal, thereforeIn view of in specific implementation process, superconduction passes
Defeated son (Transmon) prepares defect that may be present, inevitably will produce lobe error during manipulation
(leakage error), the generation of lobe error are usually to be regarded as two-level energy system because of Qubit, however actual superconduction passes
Defeated son (Transmon) has more energy levels, when it is transitted on non-computer ground level, just produces lobe error.
DRAG method in optimal controls are used in embodiment provided by the present application, the description as described in DRAG method in optimal controls can be with
Refering to DOI:10.1103/PhysRevA.82.040305(Optimized driving of superconducting
artificial atoms for improved single-qubit gates).In embodiment provided by the present application, such as
It is realized in time range in 200ns or 150ns, by DRAG control methods by the friendship frequency signal such as with 10ns or 20ns
The stacking pattern that signal is split into for unit, to determine the frequency for handing over frequency signal.
The DRAG method in optimal controls are expressed asWherein, A, B
It is undetermined parameter, the friendship frequency signal can be represented as Ω (t)=Ωx(t)cos(ωdt)+Ωy(t)sin(ωdT), it acts on
Time range be the σ of -2 σ~2, wherein ωdTo hand over the frequency of frequency signal；DRAG control methods can largely reduce leakage
Error.In the present embodiment, frequency signal will be handed over to be divided into DRAG signals in different time periods, i.e. Ωx,n(An, t) and Ωy,n(Bn, t),
N=1,2 ..., N, and 4 σ of action time per segment signal is remained unchanged (in time range -2 σ~2 σ acted on).Initial feelings
Under condition, M group argument sequences { (A will be generated at randomn,Bn)}1,{(An,Bn)}2,…,{(An,Bn)}M, and will be imparted to the superconduction
Quantum devices.In another embodiment, under initial situation, one group of random initial parameter can also be generated in advance by feedback
Sequence, and it is transmitted to the microwave input unit.
During concrete implementation, the different period can be set according to specific performance, than
As to be set in the range of 150ns, the friendship frequency signal is such as split into letter as unit of 10ns by DRAG control methods
Number stacking pattern, then the microwave input unit is by 15 groups of the random external Optimal Parameters equipment generation for generating or receiving
Argument sequence { (An,Bn)}1,{(An,Bn)}2,…,{(An,Bn)}15, i.e. n=1,2 ... ... 15.However, it is not limited to this, not
Under same implementation environment or implementation state, it can be adopted when being overlapped processing to the friendship frequency signal using the DRAG control methods
With the frequency with the determination friendship frequency signal for splitting different time sections and different fractionation units.
It is described to receive the quantum state to be measured and the quantum state to be measured is carried out by preset measurement method current more
The intrinsic fidelity of bit gate currently hands over the intrinsic fidelity of more bit gates under frequency signal.In the present embodiment, described pre-
If measurement method be X-direction, the projection measurement on three directions of Y-direction and Z-direction, such as measurements use
The method of Randomized Benchmarking measures the more bit gate U of single under current control signaltIntrinsic fidelity
(intrinsic fidelity, i.e., fidelity neglecting decoherence), the intrinsic fidelity by
It indicates, i.e.,Wherein, UidealThe more bit gates of single being expressed as in the application, ρ are expressed as
Initial input quantum state.
In the case of 4 σ of Setting signal action time and frequency, for determining argument sequence { (An, Bn), it can obtain
Obtain the intrinsic fidelity of currently more bit operatingsI.e. with the degree of closeness of the more bit gates of target.
In the present embodiment, the feedback is obtaining M group argument sequences { (An,Bn)}1,{(An,Bn)}2..., { (An,
Bn)}MCorresponding intrinsic fidelityAfterwards, using the BFGS algorithms to object function, i.e., intrinsic fidelityIt optimizes, to obtain corresponding argument sequence under optimum control, thus just realizes and appoint
The design of the meaning more bit gates of quantum.
For be expanded on further the application based superconductive quantum calculation more bit control methods principle and effect, at one
In embodiment, the more bits manipulation for the based superconductive quantum calculation realized by system described herein is, for example, following step
Suddenly：
In physics bottom, the superconducting transmission (Transmon) for multiple cascaded structures is passed through into above-mentioned Bus
Coupling schemes are coupling on the co-planar waveguide resonant cavity of co-planar waveguide resonator, and each superconducting transmission is sub
(Transmon) a kind of quantum state, for example, ground state are prepared into：To be ground state：Initial quantum state and be, for example,
M group argument sequences { (An, Bn)}1, { (An, Bn)}2..., { (An, Bn)}MInitial microwave sequence to hand over frequency signalForm export to the Superconducting Quantum equipment；The superconduction amount
Sub- equipment is by waiting for the initial initial quantum state of input by what is exported after currently handing over more bit gates built in frequency signal handling
Quantum state is surveyed, i.e., more bit gates built in the described friendship frequency signal handling according to reception simultaneously export quantum state to be measured to so
Afterwards the current guarantor for handing over more bit gates under frequency signal is measured using for example, measurement method of Randomized Benchmarking
True degree, that is, the corresponding Clifford of traversal muliti-qubitnIt is operated in group, and carries out its inverse operation, i.e.,And average to it after traversing all operations, and then the intrinsic fidelity of current more bit gates can be obtainedThen, recycle the BFGS algorithms to object function, i.e., intrinsic fidelityIt optimizes, is supplied to feedback to export the result of optimization later, the feedback exports foundation
The intrinsic fidelity, which calculate, generates optimization microwave sequence, and the optimization microwave sequence feedback is inputted to the microwave
End is manipulated again to obtain the more bit gates of target, if input, optimization, feedback procedure is repeated several times in experience through above procedure
Dry time, finally provide optimal control parameter sequence { (An, Bn)}optimal, optimal modulation effect is finally reached, and then realize single
More bit door operations.
Referring to Fig. 6, being shown as more bit control methods of the based superconductive quantum calculation of the application in another embodiment
In flow chart, as shown, in another embodiment, the method further includes generating the step of preset initial microwave sequence
Suddenly, the preset initial microwave sequence is handled through pre-optimized.By the initial microwave sequence that is generated in advance to described
Microwave input port, the preset initial microwave sequence of generation is to be handled through pre-optimized, and then can control initial input
Beginning microwave sequence samples, and be further ensured that the Accuracy and high efficiency of operation.In the embodiment shown in fig. 6, it generates
The step S10 of preset initial microwave sequence generates M group argument sequences { (A at random under initial situationn, Bn)}1, { (An,
Bn)}2,…,{(An,Bn)}M, and the microwave input port is will be imparted to, to enable the microwave input port to hand over frequency signal It exports to the Superconducting Quantum equipment to built-in more bit gates
It is manipulated.
In the certain embodiments of the second aspect of the application, the method further includes generating preset initial microwave sequence
The step of row, the preset initial microwave sequence is handled through pre-optimized.
More bit control methods of the application based superconductive quantum calculation use co-planar waveguide resonance modules by multiple superconductions
Transmission sub (Transmon) is coupled together, and is manipulated to these quantum bits by simple microwave device, while anti-
Feedback data are simultaneously optimized according to design scheme, obtain optimum control (Optimal Control) parameter, realize the more bits of single
Door operation.Technical solution provided by the present application has expansibility high, and fidelity is high, operating time short advantage, application scenarios
Generally, and cost is relatively low.
It should be understood that in the various embodiments of the application, size of the sequence numbers of the above procedures is not meant to execute suitable
The execution sequence of the priority of sequence, each process should be determined by its function and internal logic, the implementation without coping with the embodiment of the present application
Process constitutes any restriction.
Those of ordinary skill in the art may realize that lists described in conjunction with the examples disclosed in the embodiments of the present disclosure
Member and algorithm steps can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually
It is implemented in hardware or software, depends on the specific application and design constraint of technical solution.Professional technician
Each specific application can be used different methods to achieve the described function, but this realization is it is not considered that exceed
Scope of the present application.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
In several embodiments provided herein, it should be understood that disclosed systems, devices and methods, it can be with
It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the unit
It divides, only a kind of division of logic function, formula that in actual implementation, there may be another division manner, such as multiple units or component
It can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, it is shown or
The mutual coupling, direct-coupling or communication connection discussed can be the indirect coupling by some interfaces, device or unit
It closes or communicates to connect, can be electrical, machinery or other forms.
The unit illustrated as separating component may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, you can be located at a place, or may be distributed over multiple
In network element.Some or all of unit therein can be selected according to the actual needs to realize the mesh of this embodiment scheme
's.
In addition, each functional unit in each embodiment of the application can be integrated in a processing unit, it can also
It is that each unit physically exists alone, it can also be during two or more units be integrated in one unit.
The principles and effects of the application are only illustrated in above-described embodiment, not for limitation the application.It is any ripe
Know the personage of this technology all can without prejudice to spirit herein and under the scope of, carry out modifications and changes to above-described embodiment.Cause
This, those of ordinary skill in the art is complete without departing from spirit disclosed herein and institute under technological thought such as
At all equivalent modifications or change, should be covered by claims hereof.
Claims (21)
1. a kind of more bit control systems of based superconductive quantum calculation, which is characterized in that including：
Microwave input module, for by initial quantum state and initial microwave sequence to hand over frequency signal to export；
Superconducting Quantum module for more bit gates built in the friendship frequency signal handling according to reception and exports quantum to be measured
State；
Measurement module, for receiving the quantum state to be measured and measuring to obtain the intrinsic fidelity of current more bit gates；
And
Feedback module generates optimization microwave sequence for according to the intrinsic fidelity calculate, and by the optimization microwave
Sequence feedback is manipulated again to the microwave input module to obtain the more bit gates of target.
2. more bit control systems of based superconductive quantum calculation according to claim 1, which is characterized in that the microwave
Input module includes microwave device.
3. more bit control systems of based superconductive quantum calculation according to claim 1, which is characterized in that the microwave
The friendship frequency signal of input module output is the friendship frequency signal through splitting Signal averaging processing in different time periods.
4. more bit control systems of based superconductive quantum calculation according to claim 1, which is characterized in that the superconduction
Quantum module includes co-planar waveguide resonant cavity, and the co-planar waveguide resonant cavity includes superconducting transmission of multiple cascaded structures
(Transmon), each superconducting transmission (Transmon) is made of Cooper pair box.
5. more bit control systems of based superconductive quantum calculation according to claim 4, which is characterized in that the superconduction
Quantum module includes co-planar waveguide resonator.
6. more bit control systems of based superconductive quantum calculation according to claim 4, which is characterized in that multiple series connection
The superconducting transmission of structure sub (Transmon) is coupled by bus and the co-planar waveguide resonant cavity.
7. more bit control systems of based superconductive quantum calculation according to claim 1, which is characterized in that the measurement
Module includes：
Signal measurement unit, for receiving the quantum state to be measured；
Fidelity computing unit is consolidated for carrying out current more bit gates to the quantum state to be measured by preset measurement method
There is fidelity.
8. more bit control systems of based superconductive quantum calculation according to claim 1, which is characterized in that described default
Measurement method be the directions X-Y-Z projection measurement.
9. more bit control systems of based superconductive quantum calculation according to claim 1, which is characterized in that described default
Measurement method be RB (Randomized Benchmarking) measure, tomoscan (Tomography) measure, door collection make and break
Layer scanning (Gate Set Tomography) measures or estimation error (Error Mitigation) measures.
10. more bit control systems of based superconductive quantum calculation according to claim 1, which is characterized in that described anti-
Presenting module includes：
Parameter optimization unit, for according to the intrinsic fidelity to the initial microwave sequence optimize processing after export it is excellent
Change microwave sequence；And
Feedback unit, for being manipulated the optimization microwave sequence feedback again to the microwave input module to obtain mesh
Mark more bit gates.
11. more bit control systems of based superconductive quantum calculation according to claim 10, which is characterized in that described anti-
Presenting module further includes：Fidelity computing unit is current more for being carried out to the quantum state to be measured by preset measurement method
The intrinsic fidelity of bit gate.
12. more bit control systems of based superconductive quantum calculation according to claim 1, which is characterized in that the ginseng
Number optimization unit optimizes processing using BFGS algorithms or Global Search algorithms to the initial microwave sequence.
13. more bit control systems of based superconductive quantum calculation according to claim 1, which is characterized in that further include
One Optimal Parameters generation module, it is described preset for sending preset initial microwave sequence to the microwave input module
Initial microwave sequence is handled through pre-optimized.
14. a kind of more bit control methods of based superconductive quantum calculation, which is characterized in that include the following steps：
By initial quantum state and initial microwave sequence to hand over frequency signal to export；
According to more bit gates built in the friendship frequency signal handling received and export quantum state to be measured；
To the quantum state to be measured and measure to obtain the intrinsic fidelity of current more bit gates；And
According to the intrinsic fidelity calculate and generate optimization microwave sequence, and the optimization microwave sequence feedback is carried out again
Secondary manipulation is to obtain the more bit gates of target.
15. more bit control methods of based superconductive quantum calculation according to claim 14, which is characterized in that the friendship
Frequency signal is the friendship frequency signal through splitting Signal averaging processing in different time periods.
16. more bit control methods of based superconductive quantum calculation according to claim 14, which is characterized in that described more
Bit gate is to be coupled by bus and a co-planar waveguide resonant cavity by the superconducting transmission (Transmon) of multiple cascaded structures
Composition, each superconducting transmission (Transmon) are made of Cooper pair box.
17. more bit control methods of based superconductive quantum calculation according to claim 14, which is characterized in that described pre-
If measurement method be the directions X-Y-Z projection measurement.
18. more bit control methods of based superconductive quantum calculation according to claim 14, which is characterized in that described pre-
If measurement method be RB (Randomized Benchmarking) measure, tomoscan (Tomography) measure, door set
Tomoscan (Gate Set Tomography) measures or estimation error (Error Mitigation) measures.
19. more bit control methods of based superconductive quantum calculation according to claim 14, which is characterized in that it is described according to
The step of carrying out calculating generation optimization microwave sequence according to the intrinsic fidelity includes according to the intrinsic fidelity to described first
Beginning microwave sequence optimizes output optimization microwave sequence after processing.
20. more bit control methods of based superconductive quantum calculation according to claim 14, which is characterized in that the ginseng
Number optimization unit optimizes processing using BFGS algorithms or Global Search algorithms to the initial microwave sequence.
21. more bit control methods of based superconductive quantum calculation according to claim 14, which is characterized in that further include
The step of generating preset initial microwave sequence, the preset initial microwave sequence is handled through pre-optimized.
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| CN113011591A (en) * | 2020-11-09 | 2021-06-22 | 深圳市腾讯计算机***有限公司 | Quantum measurement and control system for multi-bit quantum feedback control |
| CN113011591B (en) * | 2020-11-09 | 2023-07-28 | 深圳市腾讯计算机***有限公司 | Quantum measurement and control system for multi-bit quantum feedback control |
| CN115545204A (en) * | 2021-06-30 | 2022-12-30 | 合肥本源量子计算科技有限责任公司 | Method and device for determining multi-quantum bit measurement result and quantum computer |
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| WO2023125216A1 (en) * | 2021-12-27 | 2023-07-06 | 合肥本源量子计算科技有限责任公司 | Method and apparatus for determining multi-qubit measurement result, and quantum computer |
| CN115132910A (en) * | 2022-08-30 | 2022-09-30 | 材料科学姑苏实验室 | Measuring device for surface distribution of two-level defects and preparation method thereof |
| CN115132910B (en) * | 2022-08-30 | 2022-11-25 | 材料科学姑苏实验室 | Measuring device for surface distribution of two-level defects and preparation method thereof |
| CN115600680A (en) * | 2022-09-30 | 2023-01-13 | 中国科学技术大学（Cn） | Quantum computation low-delay feedback control device and method based on radio frequency switch |
| CN115600680B (en) * | 2022-09-30 | 2023-04-21 | 中国科学技术大学 | Quantum computation low-delay feedback control device and method based on radio frequency switch |
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