公开(公告)号：US20240220836A1

公开(公告)日：2024-07-04

申请号：US18401103

申请日：2023-12-29

Applicant: Google LLC

Inventor： Dripto Mazumdar Debroy ,  Vadim Smelyanskiy ,  Wojciech Jerzy Mruczkiewicz ,  Zhang Jiang ,  Élie Genois ,  Jonathan Arthur Gross

IPC: G06N10/20 ,  G06N10/40 ,  G06N10/70

CPC classification number: G06N10/20 ,  G06N10/40 ,  G06N10/70

Abstract: Systems and methods for quantum computing devices are provided. In one example, a method may include preparing one or more qubits in a selected initial state of a set of initial states. The method may include implementing a first quantum circuit for n repetitions on the one or more qubits, the first quantum circuit comprising one or more quantum gates. The method may include implementing a second quantum circuit to map a state of the one or more qubits towards a target state, the second quantum circuit based on a unitary associated with the first quantum circuit. The method may include performing a measurement of the one or more qubits. The method may include determining a fidelity between the first quantum circuit and the unitary based at least in part on the measurement of the one or more qubits.

公开(公告)号：US12206412B2

公开(公告)日：2025-01-21

申请号：US18320532

申请日：2023-05-19

Applicant: Google LLC

Inventor： Dripto Mazumdar Debroy ,  Jonathan Arthur Gross ,  Zhang Jiang ,  Wojtek Jerzy Mruczkiewicz

IPC: H03K19/195 ,  G06N10/40

Abstract: The disclosure is directed to characterizing a quantum logic circuit (QLC), via a set of intrinsic parameters. One method includes selecting control vectors that are associated with phase shifts for the intrinsic parameters such that experimental unitary operators for the QLC are defined. Each experimental unitary operator is based on the intrinsic parameters and phase shifts associated with a corresponding control vector. For each control vector, eigenvalues for the corresponding unitary operator are estimated based on qubit measurements performed subsequent to tuning the QLC in accordance with the control vector. The eigenvalues correspond to quasienergy levels of the qubits. Values for the set of intrinsic parameters may be determined based on the eigenvalues.

公开(公告)号：US20240388297A1

公开(公告)日：2024-11-21

申请号：US18320532

申请日：2023-05-19

Applicant: Google LLC

Inventor： Dripto Mazumdar Debroy ,  Jonathan Arthur Gross ,  Zhang Jiang ,  Wojtek Jerzy Mruczkiewicz

IPC: H03K19/195 ,  G06N10/40

Abstract: The disclosure is directed to characterizing a quantum logic circuit (QLC), via a set of intrinsic parameters. One method includes selecting control vectors that are associated with phase shifts for the intrinsic parameters such that experimental unitary operators for the QLC are defined. Each experimental unitary operator is based on the intrinsic parameters and phase shifts associated with a corresponding control vector. For each control vector, eigenvalues for the corresponding unitary operator are estimated based on qubit measurements performed subsequent to tuning the QLC in accordance with the control vector. The eigenvalues correspond to quasienergy levels of the qubits. Values for the set of intrinsic parameters may be determined based on the eigenvalues.