US 12,175,334 B2
Method for processing frequency control signal of qubit and superconducting quantum chip
Zhenxing Zhang, Guangdong (CN); Yu Zhou, Guangdong (CN); Yarui Zheng, Guangdong (CN); and Shengyu Zhang, Guangdong (CN)
Assigned to TENCENT TECHNOLOGY (SHENZHEN) COMPANY LIMITED, Shenzhen (CN)
Filed by TENCENT TECHNOLOGY (SHENZHEN) COMPANY LIMITED, Guangdong (CN)
Filed on Jan. 26, 2022, as Appl. No. 17/585,471.
Application 17/585,471 is a continuation of application No. PCT/CN2021/111277, filed on Aug. 6, 2021.
Claims priority of application No. 202011073820.5 (CN), filed on Oct. 9, 2020.
Prior Publication US 2022/0147859 A1, May 12, 2022
Int. Cl. G06N 10/40 (2022.01)
CPC G06N 10/40 (2022.01) 20 Claims
OG exemplary drawing
 
1. A method for processing a frequency control signal, comprising:
determining a target qubit corresponding to the frequency control signal;
providing a square wave pulse to the target qubit;
controlling, after a first time elapses from an end time of the square wave pulse, the target qubit to rotate around a Y axis by a first target distance, the first time having a value that is variable;
performing, after a second time elapses from the first time, a quantum state tomography (QST) measurement on the target qubit;
reconstructing a density matrix of the target qubit based on the QST measurement to obtain a phase parameter value of the target qubit associated with the value of the first time;
varying the first time and repeating the QST measurement in response to values of the first time to obtain phase parameter values of the target qubit associated with the values of the first time; and
adjusting the frequency control signal based on the phase parameter values of the target qubit associated with the values of the first time.