CN-121998113-A - Quantum state reading method, quantum computing measurement and control system and storage medium

CN121998113ACN 121998113 ACN121998113 ACN 121998113ACN-121998113-A

Abstract

The embodiment of the application provides a quantum state reading method, a quantum computing measurement and control system and a storage medium. The method comprises the steps of obtaining quantum measurement and control information, triggering a first reading operation of a quantum state of a target quantum bit at the current moment through a reading signal line to obtain a first reading result after a first time delay at the current moment, triggering the target quantum bit through a bit signal line to execute target quantum logic gate operation based on a second waveform parameter, triggering a second reading operation of the quantum state of the target quantum bit after the target quantum logic gate operation is completed through the reading signal line to obtain a second reading result based on the first waveform parameter and the second time delay, and determining the second reading result as a target reading result corresponding to the target quantum logic gate operation when the first reading result is the target quantum state. By the technical scheme provided by the embodiment of the application, the fidelity of quantum state reading is improved.

Inventors

Request for anonymity
KONG WEICHENG

Assignees

本源量子计算科技（合肥）股份有限公司

Dates

Publication Date: 20260508
Application Date: 20241031

Claims (12)

1. A method of quantum state reading, characterized by being applied to a quantum computing measurement and control system, the method comprising: Acquiring quantum measurement and control information required by a target quantum bit to execute target quantum logic gate operation, wherein the quantum measurement and control information comprises a first waveform parameter, a first delay and a second delay corresponding to a read signal line and a second waveform parameter corresponding to a bit signal line, the first delay is used for indicating a trigger delay corresponding to a first read operation, and the second delay is used for indicating acquisition waiting delay of a quantum state read process; after a first delay at the current moment, triggering a first reading operation of the quantum state at the current moment of the target quantum bit through the reading signal line based on the first waveform parameter and the second delay to obtain a first reading result; Triggering the target qubit to perform the target quantum logic gate operation through the bit signal line based on the second waveform parameter; Triggering a second reading operation of the quantum state of the target quantum bit after the target quantum logic gate operation is completed through the reading signal line based on the first waveform parameter and the second delay to obtain a second reading result, wherein the first delay, the second delay and a target time interval are all integer multiples of the least common multiple between a digital-to-analog conversion sampling period and an analog-to-digital conversion sampling period, and the target time interval is the time difference between the triggering time of the second reading operation and the completion time of the first reading operation; And when the first reading result is a target quantum state, determining the second reading result as a target reading result corresponding to the target quantum logic gate operation.
2. The method of claim 1, wherein the bit signal line comprises a pulse modulation line and a magnetic flux modulation line corresponding to the target qubit, and wherein the second waveform parameter comprises a third waveform parameter corresponding to the pulse modulation line and a fourth waveform parameter corresponding to the magnetic flux modulation line; The step of triggering the target qubit to perform the target quantum logic gate operation through the bit signal line based on the second waveform parameter includes: Generating a driving signal to be transmitted on the pulse modulation line according to the third waveform parameter; Generating a control signal to be transmitted on the magnetic flux modulation line according to the fourth waveform parameter; And transmitting the driving signal to be transmitted and the control signal to be transmitted to the target qubit through the pulse modulation line and the magnetic flux modulation line respectively, so that the target qubit performs the target quantum logic gate operation based on the driving signal and the control signal.
3. The method of claim 2, wherein the quantum measurement and control information further comprises a third delay between the pulse modulation line and the magnetic flux modulation line, the third delay determined based on a signal propagation delay between the pulse modulation line and the magnetic flux modulation line; The step of transmitting the driving signal to be transmitted and the control signal to be transmitted to the target qubit through the pulse modulation line and the magnetic flux modulation line, respectively, includes: And transmitting the driving signal to be transmitted and the control signal to be transmitted to the target qubit through the pulse modulation line and the magnetic flux modulation line respectively based on the third delay.
4. The method of claim 2, wherein the quantum measurement and control information further includes a fifth waveform parameter and a first execution duration corresponding to a zero bias operation on the magnetic flux modulation line; before triggering the target qubit to perform the target quantum logic gate operation through the bit signal line based on the second waveform parameter, the method further comprises: and transmitting zero bias signals matched with the first execution duration to the target quantum bit through the magnetic flux modulation line according to the fifth waveform parameters.
5. The method of claim 4, wherein before triggering a second read operation of the target qubit in a quantum state after completing the target quantum logic gate operation via the read signal line based on the first waveform parameter and the second delay, the method further comprises: calculating a compensation time delay corresponding to a second reading operation according to the first execution time length and a second execution time length of the target quantum logic gate operation, wherein the sum of the first execution time length, the second execution time length and the compensation time delay is an integer multiple of the least common multiple; The step of triggering, based on the first waveform parameter and the second delay, a second reading operation of the quantum state of the target qubit after completing the operation of the target quantum logic gate through the reading signal line, to obtain a second reading result includes: and triggering the second reading operation of the quantum state of the target quantum bit after the target quantum logic gate operation is completed through the reading signal line based on the first waveform parameter, the second delay and the compensation delay, so as to obtain a second reading result.
6. The method of claim 2, wherein the quantum measurement and control information further includes a second execution duration of the target quantum logic gate operation and a sixth waveform parameter corresponding to the operating point frequency reading operation on the magnetic flux modulation line; After transmitting the to-be-transmitted driving signal and the to-be-transmitted control signal to the target qubit through the pulse modulation line and the magnetic flux modulation line, respectively, the method further includes: and after the second execution time length of the control signal to be transmitted is sent, transmitting a first reading signal to the target quantum bit through the magnetic flux modulation line according to the sixth waveform parameter.
7. The method of claim 6, wherein prior to triggering the target qubit via the bit signal line to perform the target quantum logic gate operation based on the second waveform parameter, the method further comprises: And transmitting a second reading signal to the target quantum bit through the magnetic flux modulation line according to the sixth waveform parameter, wherein the triggering time of the second reading signal is the same as that of the first reading operation, and the execution duration corresponding to the second reading signal is the same as that of the first reading operation.
8. The method of claim 5 or 6, wherein if the compensation delay is non-zero, the method further comprises, prior to transmitting a first read signal to the target qubit through the flux modulation line according to the sixth waveform parameter: and transmitting zero bias signals matched with the compensation time delay to the target quantum bit through the magnetic flux modulation line according to a fifth waveform parameter.
9. The method according to claim 1, wherein the step of triggering a first read operation for the target qubit current time quantum state through the read signal line after the first delay at the current time based on the first waveform parameter and the second delay to obtain a first read result includes: Transmitting a third reading signal matched with the first waveform parameter through the reading signal line after a first time delay at the current moment, and acquiring and measuring the signal on the reading signal line after a second time delay at the current moment to obtain a first reading result corresponding to a first reading operation; The step of triggering, based on the first waveform parameter and the second delay, a second reading operation of the quantum state of the target qubit after completing the operation of the target quantum logic gate through the reading signal line, to obtain a second reading result includes: And transmitting a fourth reading signal matched with the first waveform parameter through the reading signal line, and acquiring and measuring the signal on the reading signal line after a second delay at the current moment to obtain a second reading result corresponding to a second reading operation.
10. A quantum computing measurement and control system, the quantum computing measurement and control system comprising: The device comprises an acquisition module, a quantum state reading module and a quantum state reading module, wherein the acquisition module is used for acquiring quantum measurement and control information required by target quantum bit execution target quantum logic gate operation, the quantum measurement and control information comprises a first waveform parameter, a first delay and a second delay which correspond to a reading signal line, and a second waveform parameter which corresponds to a bit signal line, the first delay is used for indicating a trigger delay corresponding to a first reading operation, and the second delay is used for indicating a collection waiting delay in a quantum state reading process; the first reading module is used for triggering a first reading operation of the quantum state of the target quantum bit at the current moment through the reading signal line based on the first waveform parameter and the second delay after the first delay at the current moment to obtain a first reading result; The triggering module is used for triggering the target quantum bit to execute the target quantum logic gate operation through the bit signal line based on the second waveform parameter; The second reading module is used for triggering the second reading operation of the quantum state of the target quantum bit after the target quantum logic gate operation is completed through the reading signal line based on the first waveform parameter and the second delay to obtain a second reading result, wherein the first delay, the second delay and a target time interval are all integer multiples of the least common multiple between a digital-to-analog conversion sampling period and an analog-to-digital conversion sampling period, and the target time interval is the time difference between the triggering time of the second reading operation and the finishing time of the first reading operation; And the determining module is used for determining the second reading result as a target reading result corresponding to the target quantum logic gate operation when the first reading result is the target quantum state.
11. The quantum computing measurement and control system is characterized by comprising a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory are communicated with each other through the communication bus; A memory for storing a computer program; a processor for carrying out the method steps of any one of claims 1-9 when executing a program stored on a memory.
12. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored therein a computer program which, when executed by a processor, implements the method steps of any of claims 1-9.

Description

Quantum state reading method, quantum computing measurement and control system and storage medium Technical Field The application relates to the technical field of quantum measurement and control, in particular to a quantum state reading method, a quantum computing measurement and control system and a storage medium. Background In the quantum logic gate operation execution process, in order to avoid the influence of the uncertainty of the initial state of the quantum bit on the accuracy of the quantum state reading result, the quantum state reading can be performed in a pre-measurement mode, namely, the quantum state reading is performed before and after the quantum logic gate operation is executed, so that the reading result after the execution is screened according to the reading result before the execution, and the fidelity of the quantum state reading is improved. However, with the iterative update of the quantum computing measurement and control system in the quantum computer, the known quantum computing measurement and control system is limited by hardware conditions, so that the reading trigger delay on a reading signal line is inconsistent with the signal acquisition delay, and the quantum state reading is affected. Disclosure of Invention The embodiment of the application aims to provide a quantum state reading method, a quantum computing measurement and control system and a storage medium so as to improve the fidelity of quantum state reading. The specific technical scheme is as follows: The embodiment of the application provides a quantum state reading method which is applied to a quantum computing measurement and control system, and comprises the following steps: Acquiring quantum measurement and control information required by a target quantum bit to execute target quantum logic gate operation, wherein the quantum measurement and control information comprises a first waveform parameter, a first delay and a second delay corresponding to a read signal line and a second waveform parameter corresponding to a bit signal line, the first delay is used for indicating a trigger delay corresponding to a first read operation, and the second delay is used for indicating acquisition waiting delay of a quantum state read process; after a first delay at the current moment, triggering a first reading operation of the quantum state at the current moment of the target quantum bit through the reading signal line based on the first waveform parameter and the second delay to obtain a first reading result; Triggering the target qubit to perform the target quantum logic gate operation through the bit signal line based on the second waveform parameter; Triggering a second reading operation of the quantum state of the target quantum bit after the target quantum logic gate operation is completed through the reading signal line based on the first waveform parameter and the second delay to obtain a second reading result, wherein the first delay, the second delay and a target time interval are all integer multiples of the least common multiple between a digital-to-analog conversion sampling period and an analog-to-digital conversion sampling period, and the target time interval is the time difference between the triggering time of the second reading operation and the completion time of the first reading operation; And when the first reading result is a target quantum state, determining the second reading result as a target reading result corresponding to the target quantum logic gate operation. The embodiment of the application also provides a quantum computing measurement and control system, which comprises: The device comprises an acquisition module, a quantum state reading module and a quantum state reading module, wherein the acquisition module is used for acquiring quantum measurement and control information required by target quantum bit execution target quantum logic gate operation, the quantum measurement and control information comprises a first waveform parameter, a first delay and a second delay which correspond to a reading signal line, and a second waveform parameter which corresponds to a bit signal line, the first delay is used for indicating a trigger delay corresponding to a first reading operation, and the second delay is used for indicating a collection waiting delay in a quantum state reading process; the first reading module is used for triggering a first reading operation of the quantum state of the target quantum bit at the current moment through the reading signal line based on the first waveform parameter and the second delay after the first delay at the current moment to obtain a first reading result; The triggering module is used for triggering the target quantum bit to execute the target quantum logic gate operation through the bit signal line based on the second waveform parameter; The second reading module is used for triggering the second reading operation of the quantum state of the target q