CN112763768B - Driving method, system and controller for direct-current quantum small voltage - Google Patents
Driving method, system and controller for direct-current quantum small voltage Download PDFInfo
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- CN112763768B CN112763768B CN202011517649.2A CN202011517649A CN112763768B CN 112763768 B CN112763768 B CN 112763768B CN 202011517649 A CN202011517649 A CN 202011517649A CN 112763768 B CN112763768 B CN 112763768B
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Abstract
The invention discloses a driving method, a system and a controller for direct current quantum small voltage, belonging to the technical field of voltage driving; the invention adopts microwave drive frequency adjustment and combines with a bias current drive control technology, and simultaneously changes the frequency of microwave drive signals applied to the superconducting array junctions and the number of the superconducting array junctions driven by the bias current, thereby obtaining accurate direct current quantum small voltage signals and greatly reducing the deviation between the programmable Josephson voltage standard output direct current small voltage signals (1 mV-10 mV) and a nominal value.
Description
Technical Field
The invention relates to the technical field of voltage driving, in particular to a driving method, a driving system and a driving controller for direct-current quantum small voltage.
Background
The programmable Josephson quantum voltage standard is used as the highest standard to carry out magnitude transmission on an alternating current voltage parameter and a direct current voltage parameter, can realize the output of the direct current quantum voltage, can also realize the output of the alternating current voltage through dynamic scanning, and has wide application in the aspects of electrical metering, aerospace and high-end measurement of the alternating current voltage and the direct current voltage of a weapon system.
The minimum output of the dc quantum voltage realized by the programmable josephson quantum voltage standard is the first quantum voltage step of a superconducting junction. The prior driving method for the direct current quantum voltage is that a microwave source is adopted to carry out irradiation driving on a superconducting array junction in liquid helium, so that the superconducting array junction is in a zero-step state, and then a bias current driving signal is applied to the superconducting array junction, so that the superconducting array junction generates a first quantum voltage step, and at the moment, a direct current quantum voltage signal can be obtained; and driving the programmable Josephson array junctions with different numbers to obtain different direct current quantum voltage outputs. The driving method is a common driving method of the current programmable Josephson, the driving is simple and convenient, but because the voltage magnitude of the quantum voltage step is a non-integer, the output direct current quantum voltage has certain deviation with the required magnitude, and particularly when a direct current small voltage signal (1 mV-10 mV) is output, the relative numerical value of the deviation is larger.
Disclosure of Invention
The invention aims to provide a driving method, a driving system and a driving controller for a direct current quantum small voltage, so that the difference value between the actual output voltage magnitude and the nominal value is close to 0, and the accuracy of the direct current small voltage signal output is improved.
In order to achieve the purpose, the invention provides the following scheme:
a driving method for dc quantum small voltage, the method comprising:
acquiring a nominal value V of a direct-current quantum small voltage, a quantum voltage step number n of a superconducting junction and a microwave frequency f;
according to the nominal value V of the direct current quantum small voltage, the quantum voltage step number N of the superconducting junction and the microwave frequency f, N is utilized1＝V*KJCalculating the number N of the superconducting array junctions applying the bias current driving signals by using a/nf model1(ii) a The number N of the superconducting array junctions applying the bias current drive signal1Taking an integer; wherein KJIs the josephson constant;
according to the nominal value V of the direct current quantum small voltage and the number N of the superconducting array junctions applying the bias current driving signal1Using f1＝V*KJ/N1Obtaining the microwave driving frequency f by model calculation1；
According to the number N of the superconducting array junctions applying the bias current driving signal1And a microwave drive frequency f1Using V1＝N1*nf1/KJThe model obtains the actual output DC quantum small voltage value V1。
Optionally, the quantum voltage step number n of the superconducting junction is 1.
Optionally, the Josephson constant KJ＝483597.848416984GHz/V。
A drive system for dc quantum small voltages, the system comprising:
the parameter acquisition module is used for acquiring a nominal value V of the direct-current quantum small voltage, the quantum voltage step number n of the superconducting junction and the microwave frequency f;
a superconducting array junction number calculation module for utilizing N according to the DC quantum small voltage nominal value V, the quantum voltage step number N of the superconducting junction and the microwave frequency f1＝V*KJCalculating the number N of the superconducting array junctions applying the bias current driving signal by the nf model1(ii) a The number N of the superconducting array junctions applying the bias current drive signal1Taking an integer; wherein KJIs the josephson constant;
a microwave drive frequency calculation module for calculating a frequency based onThe nominal value V of the direct current quantum small voltage and the number N of the superconducting array junctions applying the bias current driving signal1Using f1＝V*KJ/N1Obtaining the microwave driving frequency f by model calculation1；
A DC quantum small voltage output module for applying bias current drive signal to the superconducting array junction number N1And a microwave drive frequency f1Using V1＝N1*nf1/KJThe model obtains the actual output DC quantum small voltage value V1。
Optionally, the quantum voltage step number n of the superconducting junction is 1.
Optionally, the Josephson constant KJ＝483597.848416984GHz/V。
A drive controller for dc quantum small voltages, the controller comprising:
the input device is used for inputting a nominal value V of the direct current quantum small voltage, the quantum voltage step number n of the superconducting junction and the microwave frequency f;
calculating the number of superconducting array junctions N for applying a bias current drive signal1The first computing device of (1); the first computing device utilizes N according to the nominal value V of the direct current quantum small voltage, the quantum voltage step number N of the superconducting junction and the microwave frequency f1＝V*KJCalculating the number N of the superconducting array junctions applying the bias current driving signals by using a/nf model1(ii) a The number N of the superconducting array junctions applying the bias current drive signal1Taking an integer; wherein KJIs the josephson constant;
for calculating the microwave drive frequency f1The second computing device of (1); the second computing device applies a bias current drive signal to the superconducting array junction according to the nominal value V of the direct current quantum small voltage and the number N of the superconducting array junctions1Using f1＝V*KJ/N1Obtaining the microwave driving frequency f by model calculation1；
The output device is used for outputting the direct current quantum small voltage; the output device drives the super of the signal according to the applied bias currentNumber of conducting array junctions N1And a microwave drive frequency f1Using V1＝N1*nf1/KJModel output DC quantum small voltage magnitude V1。
Optionally, the quantum voltage step number n of the superconducting junction is 1.
Optionally, the Josephson constant KJ＝483597.848416984GHz/V。
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the invention adopts microwave drive frequency adjustment and combines with a bias current drive control technology, and simultaneously changes the frequency of microwave drive signals applied to the superconducting array junctions and the number of the superconducting array junctions driven by the bias current, thereby obtaining accurate direct current quantum small voltage signals and greatly reducing the deviation between the programmable Josephson voltage standard output direct current small voltage signals (1 mV-10 mV) and a nominal value.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic flow diagram of a driving method for dc quantum small voltage provided by the present invention;
FIG. 2 is a schematic diagram of a driving system for DC quantum small voltage provided by the present invention;
fig. 3 is a schematic diagram of a driving controller for dc quantum small voltage provided by the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a driving method, a system and a controller for direct current quantum small voltage, which can obtain accurate direct current quantum small voltage signals.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a schematic flow chart of a driving method for a dc quantum small voltage provided by the present invention, and the method includes:
step 101: and acquiring a nominal value V of the direct current quantum small voltage, the quantum voltage step number n of the superconducting junction and the microwave frequency f.
Step 102: according to the nominal value V of the direct current quantum small voltage, the quantum voltage step number N of the superconducting junction and the microwave frequency f, N is utilized1＝V*KJCalculating the number N of the superconducting array junctions applying the bias current driving signal by the nf model1(ii) a Number N of superconducting array junctions to which bias current drive signals are applied1Taking an integer; wherein KJIs the josephson constant.
Step 103: according to the nominal value V of the direct current quantum small voltage and the number N of the superconducting array junctions for applying the bias current driving signal1Using f1＝V*KJ/N1Obtaining the microwave driving frequency f by model calculation1。
Step 104: according to the number N of the superconducting array junctions applying the bias current drive signal1And a microwave drive frequency f1Using V1＝N1*nf1/KJThe model obtains the actual output DC quantum small voltage value V1。
The quantum voltage step number n of the superconducting junction generally takes the first step in practical use, so n takes 1.
KJJosephson constant K, according to resolution # 1 of the 26 th International conference on year 5, 20/2019J＝483597.848416984GHz/V。
The method combines microwave drive frequency adjustment and bias current drive control technology, and simultaneously changes the frequency of the microwave drive signals applied to the superconducting array junctions and the number of the superconducting array junctions driven by the bias current, thereby obtaining accurate direct current quantum small voltage signals.
Fig. 2 is a schematic diagram of a driving system for dc quantum small voltage provided by the present invention, the system includes: the device comprises a parameter acquisition module 201, a superconducting array junction number calculation module 202, a microwave driving frequency calculation module 203 and a direct current quantum small voltage output module 204.
The parameter obtaining module 201 is configured to obtain a nominal value V of a dc quantum small voltage, a quantum voltage step number n of the superconducting junction, and a microwave frequency f.
The superconducting array junction number calculating module 202 is configured to utilize N according to the nominal value V of the dc quantum small voltage, the quantum voltage step number N of the superconducting junction, and the microwave frequency f1＝V*KJCalculating the number N of the superconducting array junctions applying the bias current driving signal by the nf model1(ii) a The number N of the superconducting array junctions applying the bias current drive signal1Taking an integer; wherein KJIs the josephson constant.
The microwave driving frequency calculation module 203 is configured to calculate the number N of the superconducting array junctions based on the nominal value V of the dc quantum small voltage and the bias current driving signal1Using f1＝V*KJ/N1Obtaining the microwave driving frequency f by model calculation1。
The direct current quantum small voltage output module 204 is used for applying the number N of the superconducting array junctions of the bias current driving signal according to1And a microwave drive frequency f1Using V1＝N1*nf1/KJThe model obtains the actual output DC quantum small voltage value V1。
The quantum voltage step number n of the superconducting junction is 1.
Josephson constant KJ＝483597.848416984GHz/V。
Fig. 3 is a schematic diagram of a driving controller for dc quantum small voltage provided by the present invention, the controller includes:
and the input device 301 is used for inputting a nominal value V of the direct current quantum small voltage, the quantum voltage step number n of the superconducting junction and the microwave frequency f.
Calculating the number of superconducting array junctions N for applying a bias current drive signal1The first computing device 302; the first computing device 302 utilizes N according to the nominal value V of the DC quantum small voltage, the quantum voltage step number N of the superconducting junction and the microwave frequency f1＝V*KJCalculating the number N of the superconducting array junctions applying the bias current driving signal by the nf model1(ii) a The number N of the superconducting array junctions applying the bias current drive signal1Taking an integer; wherein KJIs the josephson constant.
For calculating the microwave drive frequency f1The second computing device 303; the second computing device 303 applies a bias current drive signal to the superconducting array junction according to the nominal value V of the DC quantum small voltage and the number N of the superconducting array junctions1By using f1＝V*KJ/N1Obtaining the microwave driving frequency f by model calculation1。
An output device 304 for outputting a small dc quantum voltage; the output device 304 applies the bias current driving signal to the superconducting array junction number N1And a microwave drive frequency f1Using V1＝N1*nf1/KJModel output DC quantum small voltage magnitude V1。
The quantum voltage step number n of the superconducting junction is 1.
Josephson constant KJ＝483597.848416984GHz/V。
The invention takes the example of outputting 1mV direct current quantum voltage as an example, and introduces the method for driving the direct current quantum small voltage again in detail:
firstly, according to the required quantum voltage nominal value V is 1mV, the microwave frequency f is 70GHz and N is 1, and the formula N is followed1＝V*KJN is obtained from nf17, i.e. to obtain a quantum voltage of nominally 1mV, 7 superconducting array junctions driven by a bias current source are required.
Then according to the formula f1＝V*KJ/N1Calculating the required microwave driving frequency f1And is approximately equal to 69.0854 GHz. Adopting 69.0854GHz microwave to perform irradiation drive on the superconducting array junction in liquid helium to enable the superconducting array junction to be in a zero-step state, applying bias current drive signals to 7 superconducting array junctions to enable the superconducting array junction to generate a first quantum voltage step, and then generating a first quantum voltage step according to V1＝N1*nf1/KJThe direct current quantum voltage of 0.9999999mV can be obtained.
Actual output voltage magnitude V1Difference from nominal value V:
ΔV＝V1-V＝-0.0000001mV＝-0.1nV。
the invention adopts microwave driving frequency adjustment and a bias current driving control technology to realize the output of precise direct current quantum small voltage, can realize the micro change of the output quantum voltage value by a method of finely adjusting the microwave driving frequency under the drive of fixed bias current, and realizes the resolution test of a high-accuracy digital voltmeter.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system and the controller disclosed by the embodiment, the description is simple because the system and the controller correspond to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the foregoing, the description is not to be taken in a limiting sense.
Claims (9)
1. A driving method for a dc quantum small voltage, the method comprising:
acquiring a nominal value V of a direct current quantum small voltage, a quantum voltage step number n of a superconducting junction and a microwave frequency f;
according to the nominal value V of the direct current quantum small voltage, the quantum voltage step number N of the superconducting junction and the microwave frequency f, N is utilized1＝V*KJCalculating the number N of the superconducting array junctions applying the bias current driving signal by the nf model1(ii) a The number N of the superconducting array junctions applying the bias current drive signal1Taking an integer; wherein KJIs the josephson constant;
according to the nominal value V of the direct current quantum small voltage and the number N of the superconducting array junctions applying the bias current driving signal1By using f1＝V*KJ/N1Obtaining the microwave driving frequency f by model calculation1；
According to the number N of the superconducting array junctions applying the bias current driving signal1And a microwave drive frequency f1Using V1＝N1*nf1/KJThe model obtains the actual output DC quantum small voltage value V1。
2. The driving method for direct current quantum small voltage according to claim 1, wherein the quantum voltage step number n of the superconducting junction takes 1.
3. Driving method for direct current quantum small voltages according to claim 1 or 2, characterized in that the Josephson constant KJ＝483597.848416984GHz/V。
4. A drive system for dc quantum small voltages, the system comprising:
the parameter acquisition module is used for acquiring a nominal value V of the direct current quantum small voltage, the quantum voltage step number n of the superconducting junction and the microwave frequency f;
the superconducting array junction number calculation module is used for calculating the number of the microwave junctions according to the nominal value V of the direct current quantum small voltage, the quantum voltage step number n of the superconducting junctions and the microwaveFrequency f, using N1＝V*KJCalculating the number N of the superconducting array junctions applying the bias current driving signal by the nf model1(ii) a The number N of the superconducting array junctions applying the bias current drive signal1Taking an integer; wherein KJIs the josephson constant;
a microwave drive frequency calculation module for calculating the number N of the superconducting array junctions based on the nominal value V of the DC quantum small voltage and the bias current drive signal1Using f1＝V*KJ/N1Obtaining the microwave driving frequency f by model calculation1；
A DC quantum small voltage output module for applying bias current drive signal to the superconducting array junction number N1And a microwave drive frequency f1Using V1＝N1*nf1/KJThe model obtains the actual output DC quantum small voltage value V1。
5. The driving system for direct current quantum small voltage according to claim 4, wherein the quantum voltage step number n of the superconducting junction takes 1.
6. Driving system for direct current quanta of small voltages according to claim 4 or 5, characterized in that the Josephson constant KJ＝483597.848416984GHz/V。
7. A drive controller for dc quantum small voltage, the controller comprising:
the input device is used for inputting a nominal value V of the direct current quantum small voltage, the quantum voltage step number n of the superconducting junction and the microwave frequency f;
calculating the number of superconducting array junctions N for applying a bias current drive signal1The first computing device of (1); the first computing device utilizes N according to the nominal value V of the direct current quantum small voltage, the quantum voltage step number N of the superconducting junction and the microwave frequency f1＝V*KJCalculating by a/nf model to obtain a driving signal for applying bias currentNumber of superconducting array junctions N1(ii) a The number N of the superconducting array junctions applying the bias current drive signal1Taking an integer; wherein KJIs the josephson constant;
for calculating the microwave drive frequency f1The second computing device of (1); the second computing device is used for computing the number N of the superconducting array junctions according to the nominal value V of the direct current quantum small voltage and the bias current driving signal1Using f1＝V*KJ/N1Obtaining the microwave driving frequency f by model calculation1；
The output device is used for outputting the direct current quantum small voltage; the output device is used for applying a bias current drive signal according to the number N of the superconducting array junctions1And a microwave drive frequency f1By using V1＝N1*nf1/KJModel output DC quantum small voltage magnitude V1。
8. The driving controller for dc quantum small voltage according to claim 7, wherein the quantum voltage step number n of the superconducting junction takes 1.
9. The drive controller for dc quantumsmall voltages according to claim 7 or 8, characterised in that the josephson constant K isJ＝483597.848416984GHz/V。
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| JP3834635B2 (en) * | 2002-11-18 | 2006-10-18 | 独立行政法人産業技術総合研究所 | Voltage standard equipment |
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