	US 12,131,227 B2
	Method and apparatus for determining multi-qubit measurement result, and quantum computer
Weicheng Kong, Hefei (CN); and Hanqing Shi, Hefei (CN)
Assigned to Origin Quantum Computing Technology (Hefei) Co., Ltd, Hefei (CN)
Filed by Origin Quantum Computing Technology (Hefei) Co., Ltd, Hefei (CN)
Filed on Nov. 3, 2023, as Appl. No. 18/501,853.
Application 18/501,853 is a continuation of application No. PCT/CN2022/098712, filed on Jun. 14, 2022.
Claims priority of application No. 202110739831.0 (CN), filed on Jun. 30, 2021; and application No. 202110739832.5 (CN), filed on Jun. 30, 2021.
Prior Publication US 2024/0265290 A1, Aug. 8, 2024
Int. Cl. G06N 10/60 (2022.01)

CPC G06N 10/60 (2022.01)

11 Claims

1. A method for determining a multi-qubit measurement result, comprising:

acquiring qubit readout feedback signals for N associated qubits, wherein N is an integer greater than or equal to 2;

acquiring quantum state measurement values of the respective qubits based on the qubit readout feedback signals; and

determining measurement results of the N associated qubits based on information weights of the respective qubits and the quantum state measurement values of the respective qubits;

wherein the determining measurement results of the N associated qubits based on information weights of the respective qubits and the quantum state measurement values of the respective qubits comprises:

determining eigenvalues of the measurement results of the N associated qubits based on the information weights of the respective qubits and the quantum state measurement values of the respective qubits; and

determining the measurement results of the N associated qubits based on frequencies of occurrence of the eigenvalues of the measurement results in a plurality of times of measurements, wherein the acquiring qubit readout feedback signals for N associated qubits comprises:

simultaneously reading the qubit readout feedback signals for the N associated qubits, wherein

the determining measurement results of the N associated qubits based on information weights of the respective qubits and the quantum state measurement values of the respective qubits comprises:

determining measurement result eigenvalues and measurement result frequency values of the N associated qubits based on the information weights of the respective qubits and the quantum state measurement values of the respective qubits, wherein the information weights of the respective qubits are set based on a bit of the qubits;

correcting measurement result fidelity based on the measurement result eigenvalues; and

correcting the measurement result frequency values based on corrected measurement result fidelity to obtain multi-qubit measurement results, wherein the correcting measurement result fidelity based on the measurement result eigenvalues comprises:

determining, based on the measurement result eigenvalues, logical gate sequences that are corresponding to the respective measurement result eigenvalues and that are to be acted on the N associated qubits; and

using measurement results obtained when all the logical gate sequences respectively act on the N qubits as corrected measurement result fidelity, the determining, based on the measurement result eigenvalues, logical gate sequences that are corresponding to the respective measurement result eigenvalues and that are to be acted on the multi-qubits comprises:

determining, based on qubit information weights, specific values of quantum state eigenvalues corresponding to each qubit in the measurement result eigenvalues;

when a specific value of the quantum state eigenvalue is |1 custom character

, setting a logic gate to be acted on a corresponding qubit to an X gate;

when a specific value of the quantum state eigenvalue is |0 custom character

, setting a logic gate to be acted on a corresponding qubit to an I gate; and

determining, according to a setting rule, the logical gate sequences that are corresponding to the respective measurement result eigenvalues and that are to be acted on the multi-qubits.