CN214310661U - Josephson junction array quantum device and voltage metering system - Google Patents
Josephson junction array quantum device and voltage metering system Download PDFInfo
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- CN214310661U CN214310661U CN202022749751.7U CN202022749751U CN214310661U CN 214310661 U CN214310661 U CN 214310661U CN 202022749751 U CN202022749751 U CN 202022749751U CN 214310661 U CN214310661 U CN 214310661U
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Abstract
The utility model discloses a josephson junction array quantum device and voltage measurement system, wherein, this josephson junction array quantum device includes: a plurality of series-connected Josephson junction legs, each of the Josephson junction legs comprising: the number of the Josephson junctions and the number of the equalizing leads contained in each Josephson junction branch are the same. The utility model discloses an equal balanced lead wire and set up the josephson knot of the same quantity all is introduced at each josephson knot branch road of josephson knot array for the microwave has realized the evenly distributed of microwave power at the more balanced transmission of each josephson knot branch road of josephson knot array, thereby makes the position and the width of the quantum voltage step of josephson knot array all reach the effect of comparative optimization.
Description
Technical Field
The utility model relates to a measurement technical field, concretely relates to Josephson junction array quantum device, voltage measurement system.
Background
Voltage metering is an important metering field of basic physical quantities. The method used for voltage metering is a method based on josephson quantum voltage steps. The josephson junction array is an electronic circuit, the voltage step generated by one josephson junction is in the microvolt magnitude, the voltage in general sense needs to be in the magnitude of volt, and therefore tens of thousands of josephson junctions are required to be connected in series to output the voltage of several volts. In order to meet the demand of people for more voltage values in life, the voltage value is generally required to be divided into 8 or 16 branches, and Josephson junction arrays on the branches are connected in series to realize uniform transmission of higher voltage and microwave.
If it is necessary to realize finer voltage values, 1 or 2 branches are usually subdivided into 8 segments in the related art. Because the total microwave input power is unchanged, each lead wire can cause certain microwave power to flow to the ground end, so that the microwave power can flow to branches with more thin sections, the power obtained by the branches with less sections is less, the microwave power distribution is unbalanced, and the width of the corresponding voltage step is reduced or even can not be observed.
SUMMERY OF THE UTILITY MODEL
Therefore, the to-be-solved technical problem of the present invention lies in overcoming the defect that subdividing 1 or 2 branches in the josephson junction array in the prior art leads to the power that each section obtained is unbalanced, the voltage step is less or even can not be observed to provide a josephson junction array quantum device, voltage measurement system.
According to a first aspect, embodiments of the present invention disclose a josephson junction array quantum device, comprising: a plurality of series-connected Josephson junction legs, each of the Josephson junction legs comprising: the number of the Josephson junctions and the number of the equalizing leads contained in each Josephson junction branch are the same.
Optionally, the josephson junction comprises: two superconductors and a non-conductive layer disposed between the two superconductors.
Optionally, the number of equalization leads accessed between the plurality of josephson junctions in series is 3.
Optionally, the number of effective josephson junctions of effective josephson junction segments demarcated by adjacent equalization leads in at least 2 of the plurality of josephson junction branches is in a predetermined multiple relationship, the effective josephson junctions being josephson junctions involved in voltage metering.
Optionally, the preset multiple is 3 times.
Optionally, the equalization leads are connected to a direct current source for driving the corresponding josephson junctions.
According to the second aspect, the embodiment of the utility model provides a still disclose a voltage measurement system, include: a josephson junction array quantum device as claimed in the first aspect or any embodiment of the first aspect, for generating a plurality of step voltages; a microwave oscillator connected with the Josephson junction array quantum device for providing a microwave beam for the Josephson junction array quantum device; and the digital voltmeter is connected with the Josephson junction array quantum device and is used for displaying step voltage.
Optionally, the voltage metering system further comprises: and the upper computer is used for displaying the plurality of step voltages.
The utility model discloses technical scheme has following advantage:
1. the utility model provides a Josephson junction array quantum device, include: a plurality of josephson junction legs connected in series, each josephson junction leg comprising: the number of the Josephson junctions and the number of the equalizing leads contained in each Josephson junction branch are the same. The utility model discloses an equal balanced lead wire and set up the josephson knot of the same quantity all is introduced at each josephson knot branch road of josephson knot array for the microwave has realized the evenly distributed of microwave power at the more balanced transmission of each josephson knot branch road of josephson knot array, thereby makes the position and the width of the quantum voltage step of josephson knot array all reach the effect of comparative optimization.
2. The utility model provides a voltage metering system, include: a Josephson junction array quantum device for generating a plurality of step voltages; the microwave oscillator is connected with the Josephson junction array quantum device and used for providing a microwave beam for the Josephson junction array quantum device; and the digital voltmeter is connected with the Josephson junction array quantum device and is used for displaying the step voltage. The utility model discloses a transmit microwave oscillator to the balanced josephson junction array quantum device that distributes in, realized the evenly distributed of microwave power for the ladder voltage that obtains is more even.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a diagram of a josephson junction array quantum device according to an embodiment of the present invention;
fig. 2 is a schematic block diagram of a specific example of a voltage metering system according to an embodiment of the present invention.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
The embodiment of the utility model discloses Josephson junction array quantum device, as shown in figure 1, include:
a plurality of josephson junction legs 10 connected in series, each josephson junction leg 10 comprising: a plurality of serial josephson junctions 11, a predetermined number of equalizing leads 12 connected between the serial josephson junctions 11, and the number of the josephson junctions 11 and the number of the equalizing leads 12 included in each josephson junction branch 10 are the same.
Illustratively, as shown in fig. 1, a plurality of josephson junction branches 10 are connected in series through a wire 13 to form a series loop. Each josephson junction branch 10 comprises: a plurality of josephson junctions 11 in series, and each josephson junction branch 10 comprises the same number of josephson junctions 11. The josephson junction 11 comprises: two superconductors and a very thin non-conductive layer disposed between the two superconductors.
The number of the josephson junctions 11 may be 9200, and the embodiment of the present invention does not specifically limit the number of the josephson junctions, and those skilled in the art can determine the number according to the specific voltage measurement requirement. As shown in fig. 1, the josephson junctions include effective josephson junctions 110 ("X" in fig. 1) and ineffective josephson junctions 111 ("O" in fig. 1), the number of effective josephson junctions 110 and ineffective josephson junctions 111, and the sum of josephson junctions for each josephson junction branch 10. Wherein, the effective josephson junctions 110 refer to josephson junctions participating in voltage measurement, and the ineffective josephson junctions 111 refer to josephson junctions not participating in voltage measurement, so as to balance the number of josephson junctions on each josephson junction branch 10 and ensure that each josephson junction branch 10 contains the same number of josephson junctions.
A preset number of equalizing leads 12 are connected among the plurality of josephson junctions 11 connected in series, and the number of equalizing leads 12 included in each josephson junction branch 10 is the same. The number of this balanced lead wire can be 2, also can be 3, the embodiment of the utility model provides a do not do specifically and restrict to this balanced lead wire's quantity, and the skilled person in the art can be confirmed according to actual need. The embodiment of the utility model provides an use the quantity of balanced lead wire to demonstrate for 3 examples.
The utility model provides a Josephson junction array quantum device, include: a plurality of josephson junction legs connected in series, each josephson junction leg comprising: the number of the Josephson junctions and the number of the equalizing leads contained in each Josephson junction branch are the same. The utility model discloses an equal balanced lead wire and set up the josephson knot of the same quantity all is introduced at each josephson knot branch road of josephson knot array for the microwave has realized the evenly distributed of microwave power at the more balanced transmission of each josephson knot branch road of josephson knot array, thereby makes the position and the width of the quantum voltage step of josephson knot array all reach the effect of comparative optimization.
As an optional implementation manner of the embodiment of the present invention, the number of effective josephson junctions of effective josephson junction segments divided by adjacent equalizing leads 12 in at least 2 josephson junction branches 10 of the plurality of josephson junction branches 10 is in a preset multiple relationship, and the effective josephson junctions are josephson junctions participating in voltage measurement.
Exemplarily, this preset multiple can be 2 times, also can be 3 times, the embodiment of the present invention does not specifically limit this preset multiple, and those skilled in the art can set according to actual conditions. Preferably, the preset multiple is 3 times, and a plurality of step voltages can be generated without a great number of digit sequences.
Each of the josephson junction branches 10 is divided by the equalizing lead 12, and the number of effective josephson junctions resulting in effective josephson junction segments comprises a sequence of preset multiples, for example, when the preset multiple is 3 times and the number of josephson junctions of each of the josephson junction branches 10 is 9200, the number of effective josephson junctions resulting in effective josephson junction segments after division comprises a sequence of "4, 12, 36, 108, 324, 972, 2916, 8748". It should be noted that the number of effective josephson junctions obtained after division may also include other numbers, for example, 5832, 7828, 8476, etc., and the embodiment of the present invention is not limited to the number of effective josephson junctions of the divided segments specifically, and those skilled in the art can determine the number according to the actual situation as long as the number of effective josephson junctions of the effective josephson junction segment of the josephson junction quantum device divided by the equalizing lead 12 includes a preset number sequence.
As an optional implementation manner of the embodiment of the present invention, the equalizing lead 12 is connected to a dc current source for driving the corresponding josephson junction 11.
Illustratively, the dc current source is a 16-channel low-noise dc current source, which drives the corresponding josephson junction 11 to generate a quantum voltage when a dc current is applied.
As shown in fig. 1, the josephson junction array quantum device further includes 4 capacitors 14, each capacitor is connected to 2 josephson junction branches to block direct current and alternating current, i.e. to allow microwaves to pass through, and block direct current, thereby ensuring that direct current flows from one josephson junction branch to another josephson junction branch. While allowing microwaves to be transmitted through the capacitor to the underlying josephson junction branch.
The other end of an invalid Josephson junction 111 in the Josephson junction array quantum device is connected with a capacitor, and the other end of the capacitor is grounded. The capacitor also plays a role in blocking direct current and alternating current, so that microwaves can pass through, the balance of microwave transmission is ensured, direct current is blocked, and an invalid Josephson junction does not participate in voltage measurement.
The embodiment of the utility model provides a still disclose a voltage measurement system, as shown in FIG. 2, include: a microwave oscillator 20, a josephson junction quantum device 21 and a digital voltmeter 22.
The microwave oscillator 20 is connected with the Josephson junction array quantum device 21 and used for providing a microwave beam for the Josephson junction array quantum device;
the microwave oscillator may be an electric vacuum microwave oscillator or a solid microwave oscillator, and the embodiment of the present invention is not limited to this microwave oscillator, and those skilled in the art can set the microwave oscillator according to actual situations. The microwave oscillator is used for providing microwaves with preset frequencies for the josephson junction array quantum devices 21, and the step voltages generated by the josephson junction array quantum devices are only related to the physical constants and the frequencies of the microwaves, thereby facilitating the generation of a plurality of step voltages by the josephson junction array quantum devices 21. The specific method for generating the voltage is the prior art, and is not described herein again.
And the digital voltmeter 22 is connected with the Josephson junction array quantum device 21 and is used for displaying the step voltage.
The digital voltmeter may be, for example, an agilent 34420 digital voltmeter, and the embodiments of the present invention do not specifically limit the digital voltmeter, and may be set by those skilled in the art according to practical situations.
The utility model provides a voltage metering system, include: a Josephson junction array quantum device for generating a plurality of step voltages; the microwave oscillator is connected with the Josephson junction array quantum device and used for providing a microwave beam for the Josephson junction array quantum device; and the digital voltmeter is connected with the Josephson junction array quantum device and is used for displaying the step voltage. The utility model discloses a transmit microwave oscillator to the balanced josephson junction array quantum device that distributes in, realized the evenly distributed of microwave power for the ladder voltage that obtains is more even.
As an optional implementation manner of the embodiment of the present invention, the voltage metering system further includes: and the upper computer is used for displaying a plurality of step voltages.
Illustratively, displaying a plurality of step voltages may be displayed by text, e.g., 0.4v, 0.6v, 0.8 v; the display method of the plurality of step voltages is not particularly limited, and the technical personnel in the field can set the display method according to the actual situation.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (8)
1. A josephson junction array quantum device, comprising:
a plurality of series-connected Josephson junction legs, each of the Josephson junction legs comprising: the number of the Josephson junctions and the number of the equalizing leads contained in each Josephson junction branch are the same.
2. The josephson junction array quantum device of claim 1, wherein the josephson junction comprises: two superconductors and a non-conductive layer disposed between the two superconductors.
3. The josephson junction array quantum device of claim 1, wherein the number of equalization leads accessed between the plurality of serial josephson junctions is 3.
4. The josephson junction array quantum device of claim 1, wherein the number of effective josephson junctions of effective josephson junction segments demarcated by adjacent equalization leads in at least 2 of the plurality of josephson junction branches is in a predetermined multiple relationship, the effective josephson junctions being josephson junctions involved in voltage metering.
5. The josephson junction array quantum device of claim 4, wherein the predetermined multiple is 3 times.
6. The josephson junction array quantum device of claim 1, wherein the equalization leads connect direct current sources for driving the corresponding josephson junctions.
7. A voltage metering system, comprising:
the josephson junction array quantum device of any one of claims 1-6, for generating a plurality of step voltages;
a microwave oscillator connected with the Josephson junction array quantum device for providing a microwave beam for the Josephson junction array quantum device;
and the digital voltmeter is connected with the Josephson junction array quantum device and is used for displaying step voltage.
8. The voltage metering system of claim 7, further comprising: and the upper computer is used for displaying the plurality of step voltages.
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| CN202022749751.7U CN214310661U (en) | 2020-11-24 | 2020-11-24 | Josephson junction array quantum device and voltage metering system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114200282A (en) * | 2022-02-16 | 2022-03-18 | 阿里巴巴达摩院(杭州)科技有限公司 | Test device and test method for testing by using test device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114200282A (en) * | 2022-02-16 | 2022-03-18 | 阿里巴巴达摩院(杭州)科技有限公司 | Test device and test method for testing by using test device |
| CN114200282B (en) * | 2022-02-16 | 2022-05-31 | 阿里巴巴达摩院(杭州)科技有限公司 | Test device and test method for testing by using test device |
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