公开(公告)号：US12260157B1

公开(公告)日：2025-03-25

申请号：US17109455

申请日：2020-12-02

Applicant: Google LLC

Inventor： Kevin Joseph Satzinger ,  Andrew Lorne Dunsworth ,  Kostyantyn Yevgenovych Kechedzhi ,  Julian Shaw Kelly ,  Charles James Neill ,  Pedram Roushan

IPC: G06F30/20 ,  G06N10/00 ,  G06F111/10

Abstract: Systems and methods for calibrating and initializing a system comprising a first qubit, a second qubit, and a coupler are provided. A method of initializing the system can include calibrating the system; providing a first idle resonance frequency of the first qubit and a second idle resonance frequency of the second qubit; providing the first bias for the first idle resonance frequency and the second bias for the second idle resonance frequency; determining a value of the third resonance frequency at which a difference between the first degree of coupling and the second degree of coupling is minimized, when the first resonance frequency is the first idle resonance frequency and the second resonance frequency is the second idle resonance frequency; and providing the third bias according to the determined value of the third resonance frequency.

公开(公告)号：US20210304054A1

公开(公告)日：2021-09-30

申请号：US17218690

申请日：2021-03-31

Applicant: Google LLC

Inventor： Charles James Neill ,  Vadim Smelyanskiy ,  Yu Chen ,  Xiao Mi ,  Yuezhen Niu ,  Kostyantyn Yevgenovych Kechedzhi ,  Alexander Nikolaevich Korotkov ,  Zhang Jiang

IPC: G06N10/00 ,  G06F15/16

Abstract: Systems and methods for composite quantum gate calibration for a quantum computing system are provided. In some implementations, a method includes accessing a unitary gate model describing a composite quantum gate. The unitary gate model includes a plurality of gate parameters. The method includes implementing the composite quantum gate for a plurality of gate cycles on the quantum system to amplify the plurality of gate parameters. The method includes obtaining a measurement of a state of the quantum system after implementing the composite quantum gate for the plurality of gate cycles. The method includes determining at least one of the plurality of gate parameters based at least in part on the measurement of the state of the quantum system. The method includes calibrating the composite quantum gate for the quantum computing system based at least in part on the plurality of gate parameters.