CN112444738A - Method for verifying crosstalk residue of superconducting quantum chip - Google Patents

Method for verifying crosstalk residue of superconducting quantum chip Download PDF

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CN112444738A
CN112444738A CN201910804641.5A CN201910804641A CN112444738A CN 112444738 A CN112444738 A CN 112444738A CN 201910804641 A CN201910804641 A CN 201910804641A CN 112444738 A CN112444738 A CN 112444738A
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frequency
qubit
superconducting
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crosstalk
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CN112444738B (en
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孔伟成
赵勇杰
朱美珍
杨夏
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Benyuan Quantum Computing Technology Hefei Co ltd
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Origin Quantum Computing Technology Co Ltd
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    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/28Testing of electronic circuits, e.g. by signal tracer
    • G01R31/317Testing of digital circuits
    • G01R31/3181Functional testing
    • G01R31/3185Reconfiguring for testing, e.g. LSSD, partitioning
    • G01R31/318533Reconfiguring for testing, e.g. LSSD, partitioning using scanning techniques, e.g. LSSD, Boundary Scan, JTAG
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Abstract

本发明属于芯片测试领域,具体公开了一种超导量子芯片串扰残余验证方法,包括基于串扰测量矩阵确定串扰补偿矩阵,其中:所述串扰补偿矩阵和所述串扰测量矩阵的矩阵乘积为单位矩阵;基于所述串扰补偿矩阵和所述超导量子芯片的预设工作性能,确定所述预设工作性能对应的超导量子芯片的串扰验证条件;基于预设条件和所述串扰验证条件对所述超导量子芯片执行操作,获得所述超导量子芯片的测量工作性能;通过所述测量工作性能和所述预设工作性能的比较判断所述超导量子芯片上是否存在串扰残余。本发明验证超导量子芯片串扰残余为超导量子芯片的串扰补偿提供支撑和依据。

Figure 201910804641

The invention belongs to the field of chip testing, and specifically discloses a superconducting quantum chip crosstalk residual verification method, comprising determining a crosstalk compensation matrix based on a crosstalk measurement matrix, wherein: the matrix product of the crosstalk compensation matrix and the crosstalk measurement matrix is a unit matrix ; Based on the crosstalk compensation matrix and the preset working performance of the superconducting quantum chip, determine the crosstalk verification condition of the superconducting quantum chip corresponding to the preset working performance; The superconducting quantum chip performs an operation to obtain the measurement performance of the superconducting quantum chip; and whether there is a crosstalk residue on the superconducting quantum chip is determined by comparing the measurement performance and the preset performance. The invention provides support and basis for the crosstalk compensation of the superconducting quantum chip by verifying the crosstalk residual of the superconducting quantum chip.

Figure 201910804641

Description

Method for verifying crosstalk residue of superconducting quantum chip
Technical Field
The invention belongs to the field of chip testing, and particularly relates to a crosstalk residue verification method for a superconducting quantum chip.
Background
The superconducting quantum chip is provided with a plurality of superconducting quantum bit devices, the plurality of superconducting quantum bit devices are all coupled and connected with magnetic flux modulation lines, the working performance of the superconducting quantum bit is influenced not only by the magnetic flux modulation signal provided by the magnetic flux modulation line connected with the superconducting quantum chip, but also by the magnetic flux modulation signal provided by the magnetic flux modulation lines coupled and connected with other superconducting quantum chips on the superconducting quantum chip, namely crosstalk exists between any two superconducting quantum bit devices, and the crosstalk influences the working performance of the superconducting quantum chip.
The crosstalk existing on the superconducting quantum chip is compensated, and the method has great significance for the precise operation of the superconducting quantum chip. At present, no suitable crosstalk compensation method for the superconducting quantum chip exists.
Disclosure of Invention
The invention aims to provide a method for verifying crosstalk residue of a superconducting quantum chip, which aims to overcome the defects in the prior art, can measure the working performance of the superconducting quantum chip based on a crosstalk compensation matrix determined by a crosstalk matrix obtained by measurement, and provides support and basis for crosstalk compensation of the superconducting quantum chip by verifying the crosstalk residue of the superconducting quantum chip.
The technical scheme adopted by the invention is as follows:
a superconducting quantum chip crosstalk residual verification method, the method comprising:
determining a crosstalk compensation matrix based on the crosstalk measurement matrix, wherein: the matrix product of the crosstalk compensation matrix and the crosstalk measurement matrix is an identity matrix;
determining a crosstalk verification condition of the superconducting quantum chip corresponding to the preset working performance based on the crosstalk compensation matrix and the preset working performance of the superconducting quantum chip;
performing operation on the superconducting quantum chip based on a preset condition and the crosstalk verification condition to obtain the measurement working performance of the superconducting quantum chip;
and judging whether crosstalk residues exist on the superconducting quantum chip or not by comparing the measured working performance with the preset working performance.
Furthermore, a plurality of superconducting quantum bit devices are arranged on the superconducting quantum chip; the preset working performance comprises the following steps: presetting the working frequency of a selected superconducting qubit device as a first frequency value, and presetting the working frequency of other superconducting qubit devices as a second frequency value, wherein: the first frequency value and the second frequency value are different;
determining a crosstalk verification condition of the superconducting quantum chip corresponding to the preset working performance based on the crosstalk compensation matrix and the preset working performance of the superconducting quantum chip; the method specifically comprises the following steps:
determining the pulse bias regulation signal amplitude corresponding to each superconducting qubit device based on the selected first frequency value of the superconducting qubit device, the second frequency values of other superconducting qubit devices, and the crosstalk compensation matrix, and recording as a first signal combination.
Further, the preset conditions include: each superconducting qubit device has a corresponding direct-current voltage bias signal when the second frequency value is obtained, and the direct-current voltage bias signal is recorded as a second signal combination;
the performing an operation on the superconducting quantum chip based on a preset condition and the crosstalk verification condition to obtain the measurement working performance of the superconducting quantum chip specifically includes:
under the condition that the first signal combination and the second signal combination are simultaneously applied to the superconducting qubit, respectively obtaining an operating frequency measurement of the selected superconducting qubit device and operating frequency measurements of other respective superconducting qubit devices.
Further, the obtaining of the operating frequency measurement value of the superconducting qubit device to be measured specifically includes:
aiming at the superconducting qubit device to be measured, performing an energy spectrum experiment based on a corresponding preset frequency value to determine a corresponding frequency initial value;
determining two second qubit modulation decomposition signals with interval delay parameters; the frequency of the second qubit controlled decomposed signal is equal to the initial frequency value of the superconducting qubit device, and the preset oscillation frequency of the second qubit controlled decomposed signal is a fixed value; the amplitude of the second qubit modulation decomposition signal is equal to half of the amplitude of a first qubit modulation decomposition signal required for controlling the quantum state in the superconducting qubit device to undergo a flip change, and the first qubit modulation decomposition signal is determined by means of the frequency initial value;
applying the first signal combination, the second signal combination and two second qubit modulation decomposition signals with interval delay parameters on the superconducting quantum chip;
obtaining a change curve of the superconducting qubit reading feedback signal along with the interval delay parameter between the two second qubit regulation decomposition signals, and recording the change curve as a qubit coherence time curve;
determining an oscillation actual frequency value according to the quantum bit coherence time curve;
and determining the working frequency measurement value according to the initial frequency value, the actual oscillation frequency value and the preset oscillation frequency value.
Further, the determining, by performing an energy spectrum experiment on the superconducting qubit device to be measured based on the corresponding preset frequency value, a corresponding frequency initial value specifically includes:
setting a first qubit regulation and control signal corresponding to the superconducting qubit device to be measured, wherein the first qubit regulation and control signal takes a preset frequency value corresponding to the superconducting qubit device to be measured as a center and has a set frequency range;
applying the first signal combination, the second signal combination, a first qubit modulation signal, and a superconducting qubit read signal on the superconducting quantum chip;
obtaining a variation curve of a qubit feedback reading signal along with a set frequency range of the first qubit regulation signal, and recording the variation curve as a qubit characteristic energy spectrum curve;
and determining a frequency initial value corresponding to the superconducting qubit device to be measured according to the qubit characteristic energy spectrum curve.
Further, the determining the first qubit modulation and decomposition signal by means of the initial frequency value specifically includes:
setting a preset quantum bit regulation signal with an amplitude value parameter; the amplitude value parameter of the preset qubit regulation and control signal is a series of values which are increased in an arithmetic progression in an amplitude range interval A; the frequency of the preset qubit regulation signal is equal to the initial frequency value of the superconducting qubit device;
when the first signal combination, the second signal combination and the preset qubit regulation and control signal are applied, obtaining a change curve of the superconducting qubit reading feedback signal along with the amplitude value parameter of the preset qubit regulation and control signal, and recording the change curve as a Rabi experiment oscillation attenuation curve;
and determining a specific value of an amplitude value parameter of the preset qubit regulation and control signal for realizing quantum state inversion in the qubit device for the first time according to the Rabi experimental oscillation attenuation curve, and recording the specific value as a pi pulse measurement amplitude value.
Further, the determining the first qubit modulation decomposition signal further comprises:
and adjusting the power of the preset qubit regulation and control signal according to the comparison between the pi pulse measurement amplitude value and a preset condition.
Further, the determining the working frequency measurement value according to the initial frequency value, the actual oscillation frequency value, and the preset oscillation frequency value specifically includes:
determining an oscillation frequency offset according to the oscillation actual frequency value and the oscillation preset frequency value, wherein: the oscillation frequency offset is equal to the absolute value of the difference value obtained by subtracting the oscillation preset frequency value from the oscillation actual frequency value;
determining the working frequency measurement value according to the oscillation frequency offset and the frequency initial value, wherein: the measured value of the working frequency is equal to the initial value of the frequency + -the offset of the oscillation frequency.
Further, the determining whether crosstalk residue exists on the superconducting quantum chip by comparing the measured working performance with the preset working performance specifically includes:
and comparing the working frequency measured value of the selected superconducting qubit device with the first frequency value, and comparing the working frequency measured values of other superconducting qubit devices with the second frequency values, and if the two values are equal, judging that no crosstalk residue exists.
Further, the preset working performance further includes:
replacing the selected superconducting qubit device, correspondingly updating a preset frequency value of the selected superconducting qubit device to be a first frequency updating value aiming at the replacement of the selected superconducting qubit device, and updating preset frequency values corresponding to other superconducting qubit devices to be second frequency updating values;
wherein: the first frequency updating value and the first frequency value are both frequency values corresponding to two bit working points of the superconducting qubit device;
and the second frequency updating value and the second frequency value are both frequency values corresponding to the single-bit working point of the superconducting qubit device.
Compared with the prior art, the crosstalk compensation matrix is determined based on the crosstalk measurement matrix, wherein: the matrix product of the crosstalk compensation matrix and the crosstalk measurement matrix is an identity matrix; determining a crosstalk verification condition of the superconducting quantum chip corresponding to the preset working performance based on the crosstalk compensation matrix and the preset working performance of the superconducting quantum chip; performing operation on the superconducting quantum chip based on a preset condition and the crosstalk verification condition to obtain the measurement working performance of the superconducting quantum chip; and judging whether crosstalk residues exist on the superconducting quantum chip or not by comparing the measured working performance with the preset working performance. The invention verifies that the crosstalk residue of the superconducting quantum chip provides support and basis for crosstalk compensation of the superconducting quantum chip.
Drawings
FIG. 1 is a diagram of the internal structure of a superconducting quantum chip according to the present invention;
FIG. 2 is a flow chart of a superconducting quantum chip crosstalk matrix measurement of the present invention;
FIG. 3 is a method of obtaining measured performance of a superconducting quantum chip according to the present invention;
FIG. 4 is a method for obtaining an initial frequency value of a superconducting qubit device by energy spectrum experiments according to the present invention;
FIG. 5 is a method of obtaining a first qubit modulation signal according to the invention;
FIG. 6 is a superconducting qubit characteristic spectrum plot of the present invention;
FIG. 7 is a schematic diagram of the Rabi experimental oscillation attenuation curve of the present invention;
FIG. 8 is a schematic diagram of the coherence time curve of the present invention.
Detailed Description
The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
Embodiment 1 of the present invention provides a method for verifying crosstalk residue of a superconducting quantum chip, as shown in fig. 1, a plurality of superconducting qubits are arranged on the superconducting quantum chip, and each superconducting qubit includes a superconducting qubit detector and a superconducting qubit device that are coupled to each other; one end of the superconducting qubit detector, which is far away from the superconducting qubit device, is connected to a data transmission bus integrally arranged on the superconducting quantum chip, and the data transmission bus is used for receiving superconducting qubit reading signals and transmitting superconducting qubit reading feedback signals; the superconducting qubit device is connected with a first control signal transmission line and a second control signal transmission line, the first control signal provided by the first control signal transmission line comprises a magnetic flux modulation signal, and the second control signal provided by the second control signal transmission line comprises a qubit regulation signal; wherein the magnetic flux modulation signal is used for controlling the change of the working frequency of the superconducting qubit device; the qubit modulation signal is used to control a change in a quantum state of the superconducting qubit device.
The magnetic flux modulation signal comprises a direct current voltage bias signal and/or a pulse bias regulation signal, and the direct current voltage bias signal and the pulse bias regulation signal can regulate and control the frequency of the superconducting qubit device.
Specifically, the magnetic flux modulation signal applied to any one of the superconducting qubit devices through the first control signal transmission line not only generates a coupling effect with the connected superconducting qubit device and controls the frequency of the superconducting qubit device, but also generates mutual inductance coupling with other superconducting qubit devices, so as to influence the regulation and control precision of the magnetic flux modulation signal applied to other superconducting qubit devices on the frequency of the superconducting qubit device, that is, crosstalk between any two superconducting qubits.
Crosstalk between the superconducting qubit devices can directly affect the regulation and control effect of the magnetic flux modulation signal on any one of the superconducting qubit devices on the frequency of the connected superconducting qubit device, so that the frequency of the superconducting qubit device cannot reach a predetermined target value, the overall performance of the superconducting quantum chip is affected, and the control precision of the superconducting quantum chip is affected.
The embodiment provides a crosstalk residue verification method applicable to the above superconducting quantum chip, that is, a crosstalk residue verification method of a superconducting quantum chip, as shown in fig. 2, specifically including:
step S101: determining a crosstalk compensation matrix based on the crosstalk measurement matrix, wherein: the matrix product of the crosstalk compensation matrix and the crosstalk measurement matrix is an identity matrix;
step S102: determining a crosstalk verification condition of the superconducting quantum chip corresponding to the preset working performance based on the crosstalk compensation matrix and the preset working performance of the superconducting quantum chip;
step S103: performing operation on the superconducting quantum chip based on a preset condition and the crosstalk verification condition to obtain the measurement working performance of the superconducting quantum chip;
step S104: and judging whether crosstalk residues exist on the superconducting quantum chip or not by comparing the measured working performance with the preset working performance.
The above process, determining a crosstalk compensation matrix based on the crosstalk measurement matrix, wherein: the matrix product of the crosstalk compensation matrix and the crosstalk measurement matrix is an identity matrix; then, based on the crosstalk compensation matrix and the preset working performance of the superconducting quantum chip, determining a crosstalk verification condition of the superconducting quantum chip corresponding to the preset working performance; performing operation on the superconducting quantum chip based on a preset condition and the crosstalk verification condition to obtain the measurement working performance of the superconducting quantum chip; and judging whether crosstalk residues exist on the superconducting quantum chip or not by comparing the measured working performance with the preset working performance. The matrix product of the crosstalk compensation matrix and the crosstalk measurement matrix is an identity matrix, so that the crosstalk on the superconducting quantum chip under the crosstalk verification condition determined by the crosstalk compensation matrix is compensated, and then whether crosstalk residues exist on the superconducting quantum chip is judged by comparing the measurement working performance with the preset working performance.
It is known that when the magnetic flux modulation signal is applied through the first control signal transmission line of any one of the superconducting qubit devices on the superconducting qubit chip, not only the frequency of the connected superconducting qubit device can be regulated, but also crosstalk influence is generated on the frequencies of other superconducting qubit devices, so that a crosstalk measurement matrix of all the superconducting qubit devices of the superconducting qubit chip can be obtained through testing.
It should be noted that the crosstalk matrix measurement of the superconducting qubit chip is to measure the crosstalk influence of the pulse bias control signal applied to each of the superconducting qubit devices on the superconducting qubit chip on other superconducting qubit devices, and is specifically embodied to influence the frequencies of other superconducting qubit devices.
Based on this, the determining the crosstalk compensation matrix based on the crosstalk measurement matrix in step S101 specifically includes:
step S101-1: and testing to obtain a crosstalk measurement matrix.
Specifically, any one of the superconducting qubit devices on the superconducting qubit chip is selected as a target to be measured, and the dc voltage bias signal is applied to the selected superconducting qubit device through the first control signal transmission line so that the frequency of the superconducting qubit device is at the single-bit operating point frequency; applying the pulse bias control signal with a fixed voltage value to any other superconducting qubit device on the superconducting quantum chip through the first control signal transmission line, measuring a superconducting qubit device characteristic energy spectrum curve of the selected superconducting qubit device through an energy spectrum experiment, finding the fixed voltage value and the corresponding frequency of the superconducting qubit device through the superconducting qubit device characteristic energy spectrum curve, and converting the frequency of the superconducting qubit device read through the first qubit device characteristic energy spectrum curve into an equivalent voltage value of the corresponding direct current voltage bias signal through a corresponding relation between the frequency of the superconducting qubit device and the applied direct current voltage bias signal, namely forming the pulse bias control signal applied by the other superconducting qubit devices and the direct current voltage applied to the selected superconducting qubit device The ratio of the equivalent voltage values of the bias signals.
When the fixed voltage value of the pulse bias control signal applied to the other superconducting qubit devices is set to at least 2 values, at least 2 of the ratios can be measured, and at least 2 of the ratios are fitted to obtain a fitting curve, wherein the slope of the fitting curve is recorded as a weight coefficient of a linear relationship between the pulse bias control signal and the equivalent voltage value, that is, a crosstalk coefficient between any two superconducting qubit devices. And testing the crosstalk coefficient between any two superconducting qubit devices on the superconducting quantum chip to obtain a crosstalk test matrix.
Through the described measurement process of the crosstalk test matrix, it can be found that the crosstalk test matrix represents the influence relationship that the frequency of any one superconducting qubit device is influenced by the pulse bias regulation and control signals applied to other superconducting qubit devices.
Step S101-2: setting a crosstalk compensation matrix based on the crosstalk test matrix, wherein: and the matrix product of the crosstalk compensation matrix and the crosstalk measurement matrix is an identity matrix.
The crosstalk compensation matrix satisfying the condition that the matrix product of the crosstalk compensation matrix and the crosstalk measurement matrix is an identity matrix can adjust the pulse bias regulation and control signal applied to each superconducting qubit device measured by the crosstalk test matrix to influence the frequency crosstalk of other superconducting qubit devices, and ensure that the magnetic flux modulation signal is applied through the first control signal transmission line of the superconducting qubit device, so that the frequency of the superconducting qubit devices connected to the superconducting quantum chip can reach the frequency of a single-bit working point or the frequency of two-bit working points, and the frequency of other superconducting qubit devices cannot be influenced.
The single-bit working point frequency refers to the frequency of the selected superconducting qubit when the single-bit logic gate operation is performed on the superconducting quantum chip, and when a quantum program or a quantum algorithm is operated when the single-bit working point frequency is selected, the decoherence time of the superconducting qubit is long and the algorithm fidelity is high; the two-bit operating point frequency refers to the frequency of the selected superconducting qubit when the two-bit operation is performed, and particularly, when the two-bit logic gate operation is performed, the frequency of one superconducting qubit is adjusted to one position, so that a mutual superconducting qubit effect can be generated between the position and the other superconducting qubit.
Step S102: and determining the crosstalk verification condition of the superconducting quantum chip corresponding to the preset working performance based on the crosstalk compensation matrix and the preset working performance of the superconducting quantum chip.
Specifically, the preset working performance of the superconducting quantum chip is as follows: and presetting the working frequency of a selected superconducting qubit device as a first frequency value, wherein the working frequency of other superconducting qubit devices is a second frequency value. Wherein the first frequency value is preferably a two-bit operating point frequency; the second frequency value optimizes the single-bit operating point frequency.
After the preset working performance of the crosstalk compensation matrix and the superconducting quantum chip is confirmed, some signals need to be applied to the superconducting quantum chip to enable the superconducting quantum chip to reach the preset working performance, namely, the crosstalk verification condition of the superconducting quantum chip.
Specifically, confirming that the crosstalk verification conditions of the superconducting quantum chip include:
step S102-1: determining the pulse bias regulation signal amplitude corresponding to each superconducting qubit device based on the selected first frequency value of the superconducting qubit device, the second frequency values of other superconducting qubit devices, and the crosstalk compensation matrix, and recording as a first signal combination.
It should be noted that, based on the first frequency value of the selected superconducting qubit device, the second frequency values of the other superconducting qubit devices, and the crosstalk compensation matrix, a process of determining the amplitude of the pulse bias modulation signal corresponding to each superconducting qubit device may be performed based on matrix multiplication, that is, when the crosstalk compensation matrix is multiplied to obtain a crosstalk measurement matrix, the pulse bias modulation signal (marked as an original first signal combination) is applied through the first control signal transmission line of each superconducting qubit device, so as to obtain a first signal combination (marked as an updated first signal combination).
The matrix product of the crosstalk compensation matrix and the crosstalk measurement matrix is an identity matrix. And the crosstalk measurement matrix equals the original first signal combination to the first signal combination under the influence of crosstalk; therefore, the first signal combination after crosstalk compensation is updated is equal to the first signal combination without crosstalk influence, and a preset regulation target is conveniently achieved.
In addition, in the implementation of the present invention, it is to be verified that when the frequency of the selected superconducting qubit device is converted from the first frequency value to the second frequency value, the remaining superconducting qubit devices still have the frequency in the first frequency value, by applying the updated pulse bias regulation signal to the first control signal transmission line of the selected superconducting qubit device in combination with the updated pulse bias regulation signal. Therefore, it is necessary to determine the amplitude of the pulse bias modulation signal corresponding to each of the superconducting qubit devices, and to record the amplitude of each of the pulse bias modulation signals as a first signal combination.
Step S102-2: and determining a corresponding direct-current voltage bias signal when each superconducting qubit device has the second frequency value, and recording the direct-current voltage bias signal as a second signal combination, namely a preset condition.
Specifically, the magnetic flux modulation signal applied to the magnetic flux modulation line of each qubit device includes a dc voltage bias signal and/or a pulse bias regulation signal, and both the dc voltage bias signal and the pulse bias regulation signal can regulate and control the frequency of the superconducting qubit device. In this embodiment, the pulse bias control signal needs to be adjusted based on the crosstalk compensation matrix, so that the control effect of the dc voltage bias signal is not affected by crosstalk, and therefore, in this embodiment, the dc voltage bias signal applied to each superconducting qubit device needs to be preset and recorded as a second signal combination, where the second signal combination enables the frequency of the corresponding superconducting qubit device to be at the second frequency value.
Step S103: and measuring the working performance of the superconducting quantum chip based on the determined condition of crosstalk residue verification and a preset condition.
Specifically, as shown in fig. 3, the operating frequency measurement value of the selected superconducting qubit device and the operating frequency measurement values of the other superconducting qubit devices are obtained respectively according to the crosstalk residue verification condition (the updated first signal combination) and the preset condition (the second signal combination) determined in step S102. The method specifically comprises the following steps:
and S103-1, aiming at the superconducting qubit device to be measured, carrying out an energy spectrum experiment based on a corresponding preset frequency value to determine a corresponding frequency initial value.
Specifically, as shown in fig. 4, each superconducting qubit device on the superconducting quantum chip is preset with a corresponding frequency value, and each preset frequency value is used to set a parameter of the qubit modulation signal applied to each superconducting qubit device. And performing an energy spectrum experiment through a frequency value preset by the superconducting qubit device, so as to measure a frequency initial value of the superconducting qubit device. The steps of the energy spectrum experiment comprise:
step S103-1-1: setting a first qubit regulation and control signal corresponding to the superconducting qubit device to be measured, wherein the first qubit regulation and control signal has a set frequency range centered on a preset frequency value corresponding to the superconducting qubit device to be measured.
Specifically, the first qubit adjustment signal is applied via the second control signal transmission line on the superconducting qubit device to change quantum state information in the superconducting qubit device. Therefore, the frequency of the first qubit modulation signal needs to be set near the preset frequency value of the superconducting qubit device. When the energy spectrum test is specifically implemented, the frequency of the first qubit modulation signal is set to be centered on a preset frequency value corresponding to the superconducting qubit device, and the frequency range is set. When the initial frequency value of the superconducting qubit device is tested, the frequency change of the superconducting qubit device is scanned and measured in a set frequency range, so that the measured initial frequency value of the superconducting qubit device is more accurate.
Step S103-1-2: applying the first signal combination, the second signal combination, a first qubit modulation signal, and a superconducting qubit read signal on the superconducting qubit chip.
In particular, the first signal combination, the second signal combination, is applied through the first control signal transmission line of the superconducting qubit device, wherein the first signal combination causes a selected frequency of the superconducting qubit device to be measured at a first frequency value; the second signal combination causes the other of the superconducting qubit device frequencies to be at a second frequency value; and applying the first qubit modulation signal via the second control signal transmission line of the superconducting qubit device. The frequency information and the quantum state information of the superconducting qubit device can be changed by the applied first signal combination, the applied second signal combination and the applied first qubit regulation signal, the frequency information and the quantum state information of the superconducting qubit device are read by the superconducting qubit reading signal applied by the data transmission bus on the superconducting qubit chip are changed, and the frequency information and the quantum state information of the superconducting qubit device are measured by the superconducting qubit reading feedback signal received by the data transmission bus on the superconducting qubit chip.
Step S103-1-3: and obtaining a change curve of the qubit feedback reading signal along with the set frequency range of the first qubit regulation signal, and recording the change curve as a qubit characteristic energy spectrum curve.
Specifically, the qubit feedback read signal is received through the data transmission bus on the superconducting qubit chip, wherein the frequency information of the qubit detector is measured by the superconducting qubit feedback signal; in particular, it is reflected in a change of the dispersion drift value of the frequency of the qubit detector. And the change in the frequency dispersion drift value of the qubit detector is due to a change in the frequency information and/or the quantum state information of the superconducting qubit device. The first qubit modulation signal applied via the second control signal transmission line of the superconducting qubit device has a preset frequency range, and a variation curve of the qubit feedback read signal with the set frequency range of the first qubit modulation signal can be measured, that is, a variation curve of the frequency of the superconducting qubit device with the frequency of the first qubit modulation signal is measured. This step of the experiment may also be referred to as a spectrum experiment measuring the frequency of the superconducting qubit device.
Step S103-1-4: and determining a frequency initial value corresponding to the superconducting qubit device to be measured according to the qubit characteristic energy spectrum curve.
Specifically, as shown in fig. 6, when the two-bit operating point voltage is applied through the first control signal transmission line on the superconducting qubit chip, a variation curve of the superconducting qubit reading feedback signal with the frequency of the qubit modulation signal is measured. When the frequency of the qubit modulation signal is equal to the frequency of the superconducting qubit device, the response effect of the superconducting qubit device is most obvious, and the frequency corresponding to the peak of the signal peak in the characteristic energy spectrum curve of the superconducting qubit device measured at the moment, namely the frequency of the superconducting qubit device, is recorded as the initial frequency value of the superconducting qubit device.
Step S103-2: determining two second qubit modulation decomposition signals with interval delay parameters; the frequency of the second qubit controlled decomposed signal is equal to the initial frequency value of the superconducting qubit device, and the preset oscillation frequency of the second qubit controlled decomposed signal is a fixed value; the amplitude of the second qubit modulation decomposition signal is equal to half of the amplitude of a first qubit modulation decomposition signal required for controlling a quantum state in the superconducting qubit device to undergo a flip change, the first qubit modulation decomposition signal being determined by means of the frequency initial value.
Specifically, the frequency setting of the second qubit modulation decomposition signal is equal to the initial frequency value of the superconducting qubit device; the second qubit modulation decomposition signal has an amplitude equal to half of the amplitude of the first qubit modulation decomposition signal. The frequency of the first qubit modulation decomposition signal is also equal to the initial frequency value of the superconducting qubit device, and the amplitude of the first qubit modulation decomposition signal can enable a quantum state in the superconducting qubit device to be turned by 180 degrees, so that the second qubit modulation decomposition signal can enable the quantum state in the superconducting qubit device to rotate by a displacement distance of 90 degrees along a rotation axis.
Setting the second qubit modulation and decomposition signal into a plurality of Ramsey waveforms according to an interval delay parameter, wherein an oscillation preset frequency of the Ramsey waveforms is set to be a fixed value, that is, the oscillation preset frequency of the second qubit modulation and decomposition signal is a fixed value, the fixed value can be set to be between a difference value between a frequency of the second qubit modulation signal and a frequency of the superconducting qubit device and 6MHz, and the preferred embodiment of the present invention is 2 MHz.
And the second qubit regulation decomposition signal is respectively applied before and after the preset time interval. During specific operation, the second qubit regulation and decomposition signal is applied through the second control signal transmission line firstly, then the application of the second qubit regulation and decomposition signal is stopped, and the second qubit regulation and decomposition signal is applied through the second control signal transmission line for the second time after a preset time interval.
As shown in fig. 5, in the implementation of the present invention, since the frequency setting of the second qubit modulation decomposition signal is equal to the frequency value of the first qubit modulation decomposition signal; the amplitude of the second qubit controlled decomposed signal is equal to half of the amplitude of the first qubit controlled decomposed signal, and when the working performance of the superconducting quantum chip is measured, the first qubit controlled decomposed signal needs to be determined first, and the specific method comprises the following steps:
step S103-2-1: setting a preset quantum bit regulation signal with an amplitude value parameter; the amplitude value parameter of the preset qubit regulation and control signal is a series of values which are increased in an arithmetic progression in an amplitude range interval A; the frequency of the preset qubit regulation signal is equal to the initial frequency value of the superconducting qubit device.
Specifically, in the embodiment of the present invention, the frequency of the qubit modulation signal is always set to the initial frequency value of the superconducting qubit device, so that the modulation effect of the qubit modulation signal on the quantum state of the superconducting qubit device can be maximized; the power of the qubit modulation signal is always set to the first power, and the value of the first power determines the amplitude value of the preset qubit modulation signal. And setting the preset qubit regulation and control signal in an arithmetic progression increasing mode in an amplitude interval A according to the amplitude coefficient.
Wherein the amplitude interval A is defined as 0-1; it should be noted that 0-1 is actually defined as the value normalization, and 0 corresponds to the minimum value that the amplitude can be set; 1 corresponds to the maximum value to which the amplitude can be set. The amplitude coefficients are set in an arithmetic progression mode according to a stepping value of 0.01, and 100 preset qubit regulation sub-signals with fixed amplitude coefficients can be obtained.
Step S103-2-2: and when the first signal combination, the second signal combination and the preset qubit regulation and control signal are applied, obtaining a change curve of the superconducting qubit reading feedback signal along with the amplitude value parameter of the preset qubit regulation and control signal, and recording the change curve as a Rabi experimental oscillation attenuation curve.
Specifically, the first signal combination and the second signal combination are applied through the first control signal transmission line of the superconducting qubit device, the preset qubit regulation and control signal is applied through the second control signal transmission line of the superconducting qubit device, the superconducting qubit reading feedback signal is applied through the data transmission bus of the superconducting quantum chip, the corresponding superconducting qubit reading feedback signal is measured through the data transmission bus on the superconducting quantum chip, respectively, a variation curve of the superconducting qubit reading feedback signal along with an amplitude coefficient of the preset qubit regulation and control signal is obtained, and the variation curve is recorded as a Rabi experimental oscillation attenuation curve. This step may also be referred to as the Rabi experiment.
Step S103-2-3: and determining a specific value of an amplitude value parameter of the preset qubit regulation and control signal for realizing the quantum state inversion in the superconducting qubit device for the first time according to the Rabi experimental oscillation attenuation curve, and recording the specific value as a pi pulse measurement amplitude value.
Specifically, as shown in fig. 7, the amplitude coefficient of the preset qubit modulation sub-signal corresponding to the first half-cycle of the oscillation waveform is read through the Rabi experimental oscillation attenuation curve, and the amplitude coefficient needs to be determined, so as to find the preset qubit modulation sub-signal, i.e., the first qubit modulation decomposition signal, which can realize 180 quantum state inversion in the superconducting qubit device. It should be noted that Rabi experimental oscillation attenuation curve is an oscillation curve having an oscillation period, and the first half period is half of the first oscillation period.
Step S103-2-4: and adjusting the power of the preset qubit regulation and control signal according to the comparison between the pi pulse measurement amplitude value and a preset condition.
Specifically, when the amplitude coefficient of the preset qubit adjustment and control signal corresponding to the first half cycle of the oscillation waveform is read out through the Rabi experimental oscillation attenuation curve, the amplitude coefficient needs to be compared with a preset condition. The power of the preset qubit regulation signal can be adjusted, so that the read amplitude coefficient corresponding to the first half cycle of the oscillation waveform reaches a preset condition.
Wherein, adjusting the power of the preset qubit regulation signal to make the read amplitude coefficient corresponding to the first half cycle of the oscillating waveform reach a preset condition specifically includes:
a: if the amplitude coefficient is located in the first gradient of the amplitude range interval A, the power of the preset qubit regulation signal is increased;
b: if the amplitude coefficient is located in the second gradient of the amplitude range interval A, no operation is performed;
c: and if the amplitude coefficient is located in a third gradient of the amplitude range interval A, reducing the power of the preset qubit regulation signal.
In particular, the first gradient is defined as 0.95- + ∞ofthe amplitude range interval A; the second gradient is defined as 0.7-0.95 of the amplitude range interval A; the third gradient is defined as-infinity-0.7 for the amplitude range interval A.
In a specific implementation of the present invention, the amplitude coefficient of the preset condition is defined as a second gradient of the amplitude range interval a. And when the obtained amplitude coefficient of the qubit modulation sub-signal is in the second gradient, defining the qubit modulation sub-signal corresponding to the amplitude coefficient as the first qubit modulation decomposition signal.
And when the amplitude coefficient of the obtained qubit modulation sub-signal is in the first gradient, increasing the power of the preset qubit modulation signal, and then repeating the step S103-2 until the obtained amplitude coefficient of the qubit modulation sub-signal reaches a second gradient of the preset amplitude range A. And defining the qubit modulation sub-signal corresponding to the amplitude coefficient as the first qubit modulation decomposition signal.
And when the amplitude coefficient of the obtained qubit modulation sub-signal is in the third gradient, reducing the power of the preset qubit modulation signal, and then repeating the step S103-2 until the obtained amplitude coefficient of the qubit modulation sub-signal reaches a second gradient of the preset amplitude range A. And defining the qubit modulation sub-signal corresponding to the amplitude coefficient as the first qubit modulation decomposed signal.
Step S103-3: and applying the first signal combination, the second signal combination and two second qubit regulation decomposition signals with interval delay parameters on the superconducting quantum chip.
Specifically, the second qubit controlled decomposed signal having an amplitude value half of the amplitude parameter of the first qubit controlled decomposed signal is obtained from the first qubit controlled decomposed signal obtained through the Rabi experiment in the step S103-2.
Applying the first signal combination and the second signal combination to the superconducting qubit device via the first control signal transmission line, such that the superconducting qubit device to be measured operates at a two-bit operating point and other superconducting qubit devices operate at a single-bit operating point; and then applying the second qubit regulation and decomposition signal to the superconducting qubit device through a second control signal transmission line of the superconducting qubit device, then stopping applying the second qubit regulation and decomposition signal, after a preset time interval, applying the second qubit regulation and decomposition signal through the second control signal transmission line for a second time, applying the superconducting qubit reading signal through the data transmission bus, receiving the superconducting qubit reading feedback signal from the data transmission bus, and analyzing information related to a quantum state in the superconducting qubit device through the superconducting qubit reading feedback signal. This step of the experiment may also be referred to as a Ramsey experiment.
Step S103-4: obtaining a change curve of the superconducting qubit reading feedback signal along with the interval delay parameter between the two second qubit regulation decomposition signals, and recording the change curve as a qubit coherence time curve;
specifically, the superconducting qubit reading feedback signal is received from the data transmission bus, and the information related to the quantum state in the superconducting qubit device is analyzed through the superconducting qubit reading feedback signal. Wherein the qubit coherence time curve is shown in fig. 8. Each dot in fig. 8 represents a datum, i.e., information of quantum state in the superconducting qubit device measured by the superconducting qubit read feedback signal for each predetermined time interval.
And S103-5, determining an oscillation actual frequency value according to the quantum bit coherence time curve.
Specifically, the qubit coherence time curve is a curve obtained by fitting all the data measured in step S103-4 with a formula, where the formula is as follows:
y=A+B*exp(-t/T2*)*cos(2*pi*f*t)
wherein, T2*Namely, the coherence time of the superconducting qubit, f, which is the actual frequency value of the oscillation, is measured through the Ramsey experiment. From the plurality of data obtained by measurement, the value of f can be calculated by a formula.
Step S103-6: and determining the working frequency measurement value according to the initial frequency value, the actual oscillation frequency value and the preset oscillation frequency value.
Specifically, the variation of the oscillation frequency can be analyzed by comparing the actual oscillation frequency value measured by the qubit coherence time curve with a preset oscillation frequency value. The variation of the oscillation frequency represents a variation of a frequency of the second qubit modulation decomposition signal, that is, a variation of a frequency of the superconducting qubit device can also be represented.
The initial frequency value of each superconducting qubit device can be directly obtained through an energy spectrum curve of the superconducting qubit device frequency; the oscillation actual frequency value can be calculated through the qubit coherence time curve. And when the Ramsey waveform decomposition is carried out on the second qubit modulation decomposition signal, the preset oscillation frequency value is already set to be a fixed value of 2MHz, so that the working frequency measured value of the superconducting qubit device can be calculated.
Step S103-6-1: determining an oscillation frequency offset according to the oscillation actual frequency value and the oscillation preset frequency value, wherein: the oscillation frequency offset is equal to the absolute value of the difference value of the oscillation actual frequency value minus the oscillation preset frequency value.
Specifically, the frequency of the selected superconducting qubit device may change due to the influence of interference from other superconducting qubit devices, environmental interference, and the like, and thus the oscillation actual frequency value calculated from the Ramsey experimental result may also deviate from a preset oscillation frequency value. Wherein:
and the oscillation frequency offset is the oscillation actual frequency value-the oscillation preset frequency value.
Step S103-6-2: determining the working frequency measurement value according to the oscillation frequency offset and the frequency initial value, wherein: the measured value of the working frequency is equal to the initial value of the frequency + -the offset of the oscillation frequency.
Specifically, the offset of the oscillation frequency represents an offset of the oscillation frequency of the second qubit controlled decomposition signal, that is, an offset of the frequency of the superconducting qubit device can also be represented. The operating frequency measurement value of the superconducting qubit device may be further calculated by the step S103-6-1, where the oscillation frequency offset is the oscillation actual frequency value and the oscillation preset frequency value.
Namely, the measured value of the working frequency is equal to the initial value of the frequency +/-the offset of the oscillation frequency.
In the specific implementation of the invention, the oscillation actual frequency value is measured as fz' through the Rabi experimental oscillation attenuation curve, and the oscillation preset frequency value is set to be fz equal to 2 MHz; the initial value of the frequency of the superconducting qubit device is measured as fq1 through a frequency spectrum experiment of the superconducting qubit device, and then the calculation formula of the measured value of the working frequency is as follows:
fz'-fz=fq1'-fq
wherein fq1' is the calculated operating frequency measurement of the superconducting qubit device.
Step S104: and judging whether crosstalk residues exist on the superconducting quantum chip or not by comparing the measured working performance with the preset working performance.
Specifically, the operating frequency measurement value of the superconducting qubit device calculated in the step S103-6-2 is compared with the predetermined frequency of the superconducting qubit device. Comparing the operating frequency measurement to the first frequency value for the superconducting qubit device being measured; comparing the operating frequency measurement to the second frequency value for the other of the superconducting qubit devices.
When the measured operating frequency of the measured superconducting qubit device is equal to the first frequency value and the measured operating frequency of the other superconducting qubit devices is equal to the second frequency value, it may be determined that the crosstalk residue is not present on the superconducting qubit chip.
When the working frequency measurement value of any one of the superconducting qubit devices is judged to be different from the preset frequency value, it can be judged that the crosstalk residue still exists on the superconducting quantum chip, a crosstalk matrix measurement method needs to be introduced based on the obtained measurement working performance, namely the working frequency measurement value of the superconducting qubit device, a more accurate crosstalk matrix is recalculated, and then the recalculated more accurate crosstalk matrix is utilized to repeatedly execute the steps S101-S104 of the invention, perform secondary verification of the crosstalk residue, and continue to compensate and measure and judge the crosstalk residue on the superconducting quantum chip.
In summary, the present embodiment determines the crosstalk compensation matrix based on the crosstalk measurement matrix, where: the matrix product of the crosstalk compensation matrix and the crosstalk measurement matrix is an identity matrix; determining a crosstalk verification condition of the superconducting quantum chip corresponding to the preset working performance based on the crosstalk compensation matrix and the preset working performance of the superconducting quantum chip; performing operation on the superconducting quantum chip based on a preset condition and the crosstalk verification condition to obtain the measurement working performance of the superconducting quantum chip; and judging whether crosstalk residues exist on the superconducting quantum chip or not by comparing the measured working performance with the preset working performance. The invention verifies that the crosstalk residue of the superconducting quantum chip provides support and basis for crosstalk compensation of the superconducting quantum chip.
Example 2
The embodiment 2 of the invention provides a crosstalk residue verification method of a superconducting quantum chip. Embodiment 1 describes performing crosstalk residue verification for selected ones of the superconducting qubit devices on the superconducting quantum chip.
Crosstalk residue verification is required for any superconducting qubit device on the superconducting quantum chip, and it is ensured that the crosstalk compensation matrix and the pulse bias regulation and control signal applied to any superconducting qubit device do not generate crosstalk influence on the frequencies of other superconducting qubit devices.
Specifically, when crosstalk residue verification is performed on the replaced and selected superconducting qubit device, the pulse bias control signal applied to the first control signal transmission line of the replaced and selected superconducting qubit device needs to be adjusted so that a preset frequency value of the pulse bias control signal becomes a first frequency update value, and a first signal update combination is obtained; and simultaneously adjusting the pulse bias regulation and control signals applied to other superconducting qubit devices to enable the preset frequency values corresponding to other superconducting qubit devices to be second frequency updating values, so as to obtain a second signal updating combination.
Wherein: the first frequency updating value and the first frequency value are both frequency values corresponding to two bit working points of the superconducting qubit device; and the second frequency updating value and the second frequency value are both frequency values corresponding to the single-bit working point of the superconducting qubit device.
Repeating the operation of embodiment 1 by using the first signal updating combination and the second signal updating combination, measuring the crosstalk residue of the superconducting qubit device after replacement, and judging. For any of the superconducting qubit devices on the superconducting quantum chip, the first signal update combination and the second signal update combination need to be updated in sequence, and the steps of embodiment 1 are repeated to perform crosstalk residue verification.
During the performance test of the superconducting quantum chip, a crosstalk compensation matrix is calculated based on a measured specific value of a crosstalk matrix of the superconducting quantum chip, namely the crosstalk measurement matrix, the magnetic flux modulation signal applied through the first control signal transmission line on the superconducting quantum chip is calculated based on the crosstalk compensation matrix and is recorded as an update signal, and when the update signal and a direct current voltage bias signal (namely a second signal combination) act, the update signal regulates, controls and cancels the frequency of the superconducting quantum bit device which is not connected with each other so as to perform proper crosstalk compensation operation, so that the regulation and control of the frequency of the superconducting quantum bit device reach a regulation and control expected value of the direct current voltage bias signal. Effectively compensating the crosstalk on the superconducting quantum chip, so that the working performance of the superconducting quantum chip is optimal.
The construction, features and functions of the present invention are described in detail in the embodiments illustrated in the drawings, which are only preferred embodiments of the present invention, but the present invention is not limited by the drawings, and all equivalent embodiments modified or changed according to the idea of the present invention should fall within the protection scope of the present invention without departing from the spirit of the present invention covered by the description and the drawings.

Claims (10)

1.一种超导量子芯片串扰残余验证方法,其特征在于,所述方法包括:1. a superconducting quantum chip crosstalk residual verification method, is characterized in that, described method comprises: 基于串扰测量矩阵确定串扰补偿矩阵,其中:所述串扰补偿矩阵和所述串扰测量矩阵的矩阵乘积为单位矩阵;A crosstalk compensation matrix is determined based on the crosstalk measurement matrix, wherein: the matrix product of the crosstalk compensation matrix and the crosstalk measurement matrix is an identity matrix; 基于所述串扰补偿矩阵和所述超导量子芯片的预设工作性能,确定所述预设工作性能对应的超导量子芯片的串扰验证条件;Based on the crosstalk compensation matrix and the preset working performance of the superconducting quantum chip, determine the crosstalk verification condition of the superconducting quantum chip corresponding to the preset working performance; 基于预设条件和所述串扰验证条件对所述超导量子芯片执行操作,获得所述超导量子芯片的测量工作性能;Performing operations on the superconducting quantum chip based on the preset condition and the crosstalk verification condition to obtain the measurement performance of the superconducting quantum chip; 通过所述测量工作性能和所述预设工作性能的比较判断所述超导量子芯片上是否存在串扰残余。Whether there is a crosstalk residual on the superconducting quantum chip is determined by comparing the measured working performance with the preset working performance. 2.根据权利要求1所述的超导量子芯片串扰残余验证方法,其特征在于,所述超导量子芯片上设置有多个超导量子比特装置;所述预设工作性能包括:针对选定的一所述超导量子比特装置,预设其工作频率为第一频率值,其它各所述超导量子比特装置其工作频率均为第二频率值,其中:所述第一频率值和所述第二频率值不同;2. The superconducting quantum chip crosstalk residual verification method according to claim 1, wherein the superconducting quantum chip is provided with a plurality of superconducting quantum bit devices; the preset working performance comprises: for selected For one of the superconducting qubit devices, the preset operating frequency is the first frequency value, and the operating frequencies of the other superconducting qubit devices are the second frequency value, wherein: the first frequency value and the The second frequency value is different; 所述基于所述串扰补偿矩阵和所述超导量子芯片的预设工作性能,确定所述预设工作性能对应的超导量子芯片的串扰验证条件;具体包括:The crosstalk verification condition of the superconducting quantum chip corresponding to the preset working performance is determined based on the crosstalk compensation matrix and the preset working performance of the superconducting quantum chip; specifically, it includes: 基于选定所述超导量子比特装置的所述第一频率值、其它各所述超导量子比特装置的所述第二频率值和所述串扰补偿矩阵,确定各所述超导量子比特装置对应的脉冲偏置调控信号幅度,并记为第一信号组合。Each of the superconducting qubit devices is determined based on the selected first frequency value of the superconducting qubit device, the second frequency value of each of the other superconducting qubit devices, and the crosstalk compensation matrix The corresponding pulse offset modulates the signal amplitude, and is recorded as the first signal combination. 3.根据权利要求2所述的超导量子芯片串扰残余验证方法,其特征在于,所述预设条件包括:各所述超导量子比特装置具有所述第二频率值时对应的直流电压偏置信号,并记为第二信号组合;3. The superconducting quantum chip crosstalk residual verification method according to claim 2, wherein the preset condition comprises: when each of the superconducting qubit devices has the second frequency value, the corresponding DC voltage bias Set the signal, and record it as the second signal combination; 所述基于预设条件和所述串扰验证条件对所述超导量子芯片执行操作,获得所述超导量子芯片的测量工作性能,具体包括:The performing operation on the superconducting quantum chip based on the preset condition and the crosstalk verification condition to obtain the measurement performance of the superconducting quantum chip specifically includes: 在所述超导量子芯片上同时施加所述第一信号组合和所述第二信号组合的条件下,分别获得选定所述超导量子比特装置的工作频率测量值和其它各所述超导量子比特装置的工作频率测量值。Under the condition that the first signal combination and the second signal combination are simultaneously applied on the superconducting quantum chip, the measured value of the operating frequency of the selected superconducting qubit device and the other superconducting A measure of the operating frequency of a qubit device. 4.根据权利要求3所述的超导量子芯片串扰残余验证方法,其特征在于,所述获得待测量所述超导量子比特装置的工作频率测量值,具体包括:4. superconducting quantum chip crosstalk residual verification method according to claim 3, is characterized in that, described obtaining the operating frequency measurement value of described superconducting quantum bit device to be measured, specifically comprises: 针对待测量所述超导量子比特装置,基于对应的预设频率值进行能谱实验确定其对应的频率初值;For the superconducting qubit device to be measured, perform an energy spectrum experiment based on the corresponding preset frequency value to determine the corresponding initial frequency value; 确定两个具有间隔延时参数的第二量子比特调控分解信号;其中,所述第二量子比特调控分解信号的频率等于所述超导量子比特装置的频率初值,且所述第二量子比特调控分解信号的振荡预设频率为固定值;所述第二量子比特调控分解信号的幅度等于控制所述超导量子比特装置中量子态发生翻转变化的所需要的第一量子比特调控分解信号的幅度的一半,所述第一量子比特调控分解信号借助所述频率初值确定;Determine two second qubit control decomposition signals with interval delay parameters; wherein, the frequency of the second qubit control decomposition signal is equal to the initial frequency of the superconducting qubit device, and the second qubit The preset frequency of oscillation of the regulation and decomposition signal is a fixed value; the amplitude of the second qubit regulation and decomposition signal is equal to the amplitude of the first qubit regulation and decomposition signal required to control the quantum state in the superconducting qubit device to be inverted and changed. half of the amplitude, the first qubit control decomposition signal is determined by the initial frequency value; 在所述超导量子芯片上施加所述第一信号组合、所述第二信号组合,及具有间隔延时参数的两个所述第二量子比特调控分解信号;Applying the first signal combination, the second signal combination, and the two second qubit modulation decomposition signals with interval delay parameters on the superconducting quantum chip; 获得超导量子比特读取反馈信号随两个所述第二量子比特调控分解信号之间的所述间隔延时参数的变化曲线,记为量子比特相干时间曲线;Obtain the variation curve of the superconducting qubit read feedback signal with the interval delay parameter between the two second qubit regulation and decomposition signals, and record it as the qubit coherence time curve; 根据所述量子比特相干时间曲线确定振荡实际频率值;determine the actual frequency value of oscillation according to the coherence time curve of the quantum bit; 根据所述频率初值、所述振荡实际频率值和所述振荡预设频率值确定所述工作频率测量值。The measurement value of the working frequency is determined according to the initial frequency value, the actual oscillation frequency value and the preset oscillation frequency value. 5.根据权利要求4所述的超导量子芯片串扰残余验证方法,其特征在于,所述针对待测量所述超导量子比特装置,基于对应的预设频率值进行能谱实验确定其对应的频率初值,具体包括:5. The superconducting quantum chip crosstalk residual verification method according to claim 4, wherein, for the superconducting quantum bit device to be measured, an energy spectrum experiment is performed based on a corresponding preset frequency value to determine its corresponding Frequency initial value, including: 设置待测量所述超导量子比特装置对应的第一量子比特调控信号,其中,所述第一量子比特调控信号以待测量所述超导量子比特装置对应的预设频率值为中心,具有设定频率范围;Set the first qubit control signal corresponding to the superconducting qubit device to be measured, wherein the first qubit control signal is centered on the preset frequency value corresponding to the superconducting qubit device to be measured, and has a set value. fixed frequency range; 在所述超导量子芯片上施加所述第一信号组合、所述第二信号组合、第一量子比特调控信号、及超导量子比特读取信号;Applying the first signal combination, the second signal combination, the first qubit control signal, and the superconducting qubit reading signal on the superconducting quantum chip; 获得量子比特反馈读取信号随所述第一量子比特调控信号的设定频率范围的变化曲线,记为量子比特特征能谱曲线;Obtain the variation curve of the qubit feedback read signal with the set frequency range of the first qubit control signal, and record it as the qubit characteristic energy spectrum curve; 根据所述量子比特特征能谱曲线确定待测量所述超导量子比特装置对应的频率初值。The initial value of the frequency corresponding to the superconducting qubit device to be measured is determined according to the characteristic energy spectrum curve of the qubit. 6.根据权利要求4所述的超导量子芯片串扰残余验证方法,其特征在于,所述借助所述频率初值确定所述第一量子比特调控分解信号,具体包括:6. The superconducting quantum chip crosstalk residual verification method according to claim 4, wherein the determining the first qubit regulation decomposition signal with the aid of the initial frequency value, specifically comprises: 设置具有幅度值参数的预设量子比特调控信号;其中,所述预设量子比特调控信号的所述幅度值参数为在幅度范围区间A呈等差数列递增的系列值;所述预设量子比特调控信号的频率等于所述超导量子比特装置的频率初值;A preset qubit control signal with an amplitude value parameter is set; wherein, the amplitude value parameter of the preset qubit control signal is a series of values that increase in an arithmetic progression in the amplitude range interval A; the preset qubit The frequency of the control signal is equal to the initial frequency of the superconducting qubit device; 施加所述第一信号组合、所述第二信号组合和所述预设量子比特调控信号时,获得超导量子比特读取反馈信号随所述预设量子比特调控信号的所述幅度值参数的变化曲线,记为Rabi实验振荡衰减曲线;When the first signal combination, the second signal combination and the preset qubit regulation signal are applied, the superconducting qubit read feedback signal is obtained along with the amplitude value parameter of the preset qubit regulation signal. The change curve is recorded as the Rabi experimental oscillation attenuation curve; 根据所述Rabi实验振荡衰减曲线确定第一次实现量子比特装置中量子态发生翻转的所述预设量子比特调控信号的幅度值参数具体值,记为π脉冲测量幅度值。The specific value of the amplitude value parameter of the preset qubit control signal that realizes the inversion of the quantum state in the qubit device for the first time is determined according to the oscillation decay curve of the Rabi experiment, which is recorded as the π pulse measurement amplitude value. 7.根据权利要求6所述的一种量子比特工作参数检测方法,其特征在于,所述确定第一量子比特调控分解信号还包括:7. A kind of quantum bit operating parameter detection method according to claim 6, is characterized in that, described determining the first quantum bit regulation decomposition signal also comprises: 根据所述π脉冲测量幅度值和预设条件的比较调整所述预设量子比特调控信号的功率。The power of the preset qubit control signal is adjusted according to the comparison between the measured amplitude value of the π pulse and the preset condition. 8.根据权利要求4所述的超导量子芯片串扰残余验证方法,其特征在于,所述根据所述频率初值、所述振荡实际频率值和所述振荡预设频率值确定所述工作频率测量值,具体包括:8. The superconducting quantum chip crosstalk residual verification method according to claim 4, wherein the operating frequency is determined according to the initial frequency value, the oscillation actual frequency value and the oscillation preset frequency value Measurements, including: 根据所述振荡实际频率值和所述振荡预设频率值确定振荡频率偏移量,其中:所述振荡频率偏移量等于所述振荡实际频率值减去所述振荡预设频率值的差值的绝对值;The oscillation frequency offset is determined according to the oscillation actual frequency value and the oscillation preset frequency value, wherein: the oscillation frequency offset is equal to the difference between the oscillation actual frequency value and the oscillation preset frequency value the absolute value of ; 根据所述振荡频率偏移量和所述频率初值确定所述工作频率测量值,其中:所述工作频率测量值等于所述频率初值±所述振荡频率偏移量。The measured value of the working frequency is determined according to the offset of the oscillation frequency and the initial value of the frequency, wherein: the measured value of the working frequency is equal to the initial value of the frequency±the offset of the oscillation frequency. 9.根据权利要求3所述的超导量子芯片串扰残余验证方法,其特征在于,所述通过所述测量工作性能和所述预设工作性能的比较判断所述超导量子芯片上是否存在串扰残余,具体包括:9. The superconducting quantum chip crosstalk residual verification method according to claim 3, wherein the comparison of the measured work performance and the preset work performance is used to determine whether there is crosstalk on the superconducting quantum chip. Residuals, including: 比较选定所述超导量子比特装置的工作频率测量值和所述第一频率值,且比较其它各所述超导量子比特装置的工作频率测量值和所述第二频率值,如果均相等,则判断不存在串扰残余。Comparing the measured value of the operating frequency of the selected superconducting qubit device with the value of the first frequency, and comparing the measured value of the operating frequency of each of the other superconducting qubit devices with the value of the second frequency, if they are equal , then it is judged that there is no residual crosstalk. 10.根据权利要求3所述的超导量子芯片串扰残余验证方法,其特征在于,所述预设工作性能还包括:10. The superconducting quantum chip crosstalk residual verification method according to claim 3, wherein the preset working performance further comprises: 更换选定的所述超导量子比特装置,针对更换选定的超导量子比特装置,对应更新其预设频率值为第一频率更新值,以及更新其它各所述超导量子比特装置对应的预设频率值均为第二频率更新值;Replacing the selected superconducting qubit device, for replacing the selected superconducting qubit device, correspondingly update its preset frequency value to the first frequency update value, and update the corresponding values of other superconducting qubit devices. The preset frequency value is the second frequency update value; 其中:所述第一频率更新值、所述第一频率值均为对应所述超导量子比特装置位于两比特工作点的频率值;Wherein: the first frequency update value and the first frequency value are both frequency values corresponding to the superconducting qubit device located at the two-bit operating point; 所述第二频率更新值、所述第二频率值均为对应所述超导量子比特装置位于单比特工作点的频率值。The second frequency update value and the second frequency value are both frequency values corresponding to the superconducting qubit device located at a single-bit operating point.
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