CN-122021962-A - Data reading method, device, equipment and readable storage medium

CN122021962ACN 122021962 ACN122021962 ACN 122021962ACN-122021962-A

Abstract

The application discloses a data reading method, a device, equipment and a readable storage medium, and relates to the technical field of quantum computation, wherein the method comprises the steps of performing dispersion reading on quantum bits by using a reading cavity under the condition that no voltage is applied to a superconducting quantum interferometer coupled with a resonant cavity on a reading line, so as to obtain a reading test result; under the condition that the reading cavity does not meet the dispersion reading constraint by using the reading test result, acquiring a voltage value required to be applied by the superconducting quantum interferometer; the superconducting quantum interferometer generates magnetic flux in response to the voltage value, the magnetic flux changes the width of the reading cavity through coupling so that the reading cavity meets dispersion reading constraint, and under the condition that voltage corresponding to the voltage value is applied to the superconducting quantum interferometer, the reading cavity is used for carrying out dispersion reading on quantum bits to obtain a target reading result. The application has the technical effect of effectively improving the signal-to-noise ratio of bit state reading through the reading cavity with adjustable width.

Inventors

LI YONG
Liu Youhang
YU XIAOYAN

Assignees

山东云海国创云计算装备产业创新中心有限公司

Dates

Publication Date: 20260512
Application Date: 20260130

Claims (10)

1. A data reading method, comprising: Under the condition that no voltage is applied to the superconducting quantum interferometer coupled with the resonant cavity on the reading line, the reading cavity is utilized to carry out dispersion reading on the quantum bit, and a reading test result is obtained; Acquiring a voltage value required to be applied by the superconducting quantum interferometer under the condition that the reading cavity does not meet the dispersion reading constraint according to the reading test result, wherein the superconducting quantum interferometer responds to the voltage value to generate magnetic flux, and the magnetic flux changes the width of the reading cavity through coupling so as to enable the reading cavity to meet the dispersion reading constraint; and under the condition that a voltage corresponding to the voltage value is applied to the superconducting quantum interferometer, performing dispersion reading on the quantum bit by utilizing the reading cavity, and obtaining a target reading result.
2. The method of claim 1, wherein obtaining a desired applied voltage value for the superconducting quantum interferometer comprises: Acquiring the relation information of the width and the quality factor of the reading cavity; Determining a frequency of the reading cavity using the relationship information; Acquiring the dispersion displacement of the reading cavity when performing dispersion reading; determining a quality factor and a target frequency corresponding to the dispersion reading constraint based on the dispersion shift size; determining target magnetic flux according to the mapping relation between magnetic flux and frequency; And determining a voltage value corresponding to the target magnetic flux according to the corresponding relation between the magnetic flux and the applied voltage.
3. The method of claim 2, wherein obtaining the width of the read chamber comprises: Acquiring a quality factor of the reading cavity, and decoherence time of the quantum bit; The width is determined using the quality factor and the decoherence time.
4. The method of claim 2, wherein determining, based on the dispersion shift magnitude, a quality factor and a target frequency corresponding to satisfying the dispersion reading constraint comprises: by means of Determining a quality factor corresponding to the dispersion reading constraint, wherein, Subtracting the absolute value of the reading cavity frequency when the quantum bit is in a 1 state from the reading cavity frequency when the quantum bit is in a 0 state, g is the coupling strength of the reading cavity and the quantum bit, As the difference between the frequency of the qubit and the read cavity frequency when the qubit is in the 0 state, Reading the width of the cavity when the qubit is in 0 state; And acquiring the target frequency corresponding to the quality factor.
5. The method of claim 1, wherein determining whether the read cavity satisfies a dispersion reading constraint using the read test results comprises: Determining whether the doubled dispersion displacement of the reading cavity is matched with the leakage photon rate of the reading cavity by using the reading test result; If yes, determining that the reading cavity meets dispersion reading constraint; if not, it is determined that the read chamber does not meet the dispersion read constraint.
6. The method of claim 1, wherein performing a dispersion reading of the qubit with the read cavity with a voltage corresponding to the voltage value applied to the superconducting quantum interferometer to obtain a target read result, comprising: Applying a voltage corresponding to the voltage value to the superconducting quantum interferometer so that magnetic flux is generated by the magnetic flux lines of the superconducting quantum interferometer, wherein the magnetic flux lines of the superconducting quantum interferometer and the transmission line of the reading cavity are positioned on the same layer in a space position, and the magnetic flux is coupled to the reading cavity through the magnetic flux lines; The superconducting quantum interferometer and the quantum bit are positioned on the same layer on the space position, magnetic flux lines of the superconducting quantum interferometer are coupled with the reading cavity, and the width of the reading cavity is changed, so that the reading cavity meets dispersion reading constraint; and performing dispersion reading on the quantum bit by using a reading cavity meeting dispersion reading constraint to obtain the target reading result.
7. The method of claim 6, wherein the superconducting quantum interferometers are coupled to the read-in-line resonant cavity by flip-chip bonding in spatial locations.
8. A data reading apparatus, comprising: The reading test module is used for performing dispersion reading on the quantum bits by using the reading cavity under the condition that no voltage is applied to the superconducting quantum interferometer coupled with the resonant cavity on the reading line, so as to obtain a reading test result; The voltage determining module is used for acquiring a voltage value required to be applied by the superconducting quantum interferometer when the reading cavity is determined to not meet the dispersion reading constraint by utilizing the reading test result, wherein the superconducting quantum interferometer responds to the voltage value to generate magnetic flux, and the magnetic flux changes the width of the reading cavity through coupling so that the reading cavity meets the dispersion reading constraint; And the state reading module is used for carrying out dispersion reading on the quantum bit by utilizing the reading cavity under the condition that the voltage corresponding to the voltage value is applied to the superconducting quantum interferometer, so as to obtain a target reading result.
9. An electronic device, comprising: A memory for storing a computer program; Processor for implementing the steps of the data reading method according to any one of claims 1 to 7 when executing said computer program.
10. A computer-readable storage medium, in which a computer program is stored, wherein the computer program, when being executed by a processor, implements the steps of the data reading method according to any of claims 1 to 7.

Description

Data reading method, device, equipment and readable storage medium Technical Field The present application relates to the field of quantum computing technologies, and in particular, to a data reading method, device, apparatus, and readable storage medium. Background Superconducting quantum processors have single-qubit gates, double-qubit gates, and fast read operations with flexibility and high fidelity in design. In order to achieve reliable quantum computation based on experimental platforms of superconducting qubits (i.e. qubits), a qubit system with sufficiently low error rates is required to perform algorithmic demonstration. Meanwhile, the algorithm cannot be submerged by noise and errors in the execution process, so that the final output result cannot be observed normally. Thus, a need exists for a fast read of the state of superconducting qubits to reduce the occurrence of errors. In addition, the use of surface codes for physical error correction has higher requirements for fast and accurate reading of the state of the qubit. At present, reading of the state of the superconducting qubit mainly depends on dispersion interaction between a reading cavity and the superconducting qubit, and at present, the signal to noise ratio of reading is difficult to meet the requirement of practical application. Therefore, how to improve the signal-to-noise ratio of the read bit state is a technical problem that needs to be solved by those skilled in the art. Disclosure of Invention The application provides a data reading method, a device, equipment and a readable storage medium, which can effectively improve the signal-to-noise ratio of bit state reading. The application provides a data reading method, which is characterized by comprising the following steps: under the condition that no voltage is applied to the superconducting quantum interferometer coupled with the resonant cavity on the reading line, the reading cavity is utilized to carry out dispersion reading on the quantum bit, and a reading test result is obtained; Acquiring a voltage value required to be applied by the superconducting quantum interferometer under the condition that the reading cavity does not meet the dispersion reading constraint according to the reading test result, wherein the superconducting quantum interferometer responds to the voltage value to generate magnetic flux, and the magnetic flux changes the width of the reading cavity through coupling so as to enable the reading cavity to meet the dispersion reading constraint; and under the condition that a voltage corresponding to the voltage value is applied to the superconducting quantum interferometer, performing dispersion reading on the quantum bit by utilizing the reading cavity, and obtaining a target reading result. Preferably, acquiring the voltage value required to be applied by the superconducting quantum interferometer includes: Acquiring the relation information of the width and the quality factor of the reading cavity; Determining a frequency of the reading cavity using the relationship information; Acquiring the dispersion displacement of the reading cavity when performing dispersion reading; determining a quality factor and a target frequency corresponding to the dispersion reading constraint based on the dispersion shift size; determining target magnetic flux according to the mapping relation between magnetic flux and frequency; And determining a voltage value corresponding to the target magnetic flux according to the corresponding relation between the magnetic flux and the applied voltage. Preferably, acquiring the width of the reading cavity includes: Acquiring a quality factor of the reading cavity, and decoherence time of the quantum bit; The width is determined using the quality factor and the decoherence time. Preferably, determining, based on the dispersion shift size, a quality factor and a target frequency corresponding to satisfying the dispersion reading constraint includes: by means of Determining a quality factor corresponding to the dispersion reading constraint, wherein,Subtracting the absolute value of the reading cavity frequency when the quantum bit is in a 1 state from the reading cavity frequency when the quantum bit is in a 0 state, g is the coupling strength of the reading cavity and the quantum bit,As the difference between the frequency of the qubit and the read cavity frequency when the qubit is in the 0 state,Reading the width of the cavity when the qubit is in 0 state; And acquiring the target frequency corresponding to the quality factor. Preferably, determining whether the reading cavity satisfies a dispersion reading constraint using the reading test result includes: Determining whether the doubled dispersion displacement of the reading cavity is matched with the leakage photon rate of the reading cavity by using the reading test result; If yes, determining that the reading cavity meets dispersion reading constraint; if not, it is determine