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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
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.
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公开(公告)号：US20240420002A1
公开(公告)日：2024-12-19
申请号：US18336656
申请日：2023-06-16
Applicant: Google LLC
Inventor： Kevin Satzinger , Alexandre Bourassa , Dripto Mazumdar Debroy , Kenneth William Lee , Matthew Neeley
IPC: G06N10/40
Abstract: Methods, systems and apparatus for dynamically decoupling and performing a target unitary operation to a qubit. In one aspect, a method includes generating a control signal that implements a dynamical decoupling control sequence and applying the control signal to the qubit to dynamically decouple the qubit and perform the target unitary operation on the qubit. The target unitary operation includes a product of multiple sub-unitary operations. The dynamical decoupling control sequence includes a plurality of single qubit gates, where one or more of the single qubit gates comprise a single qubit gate that implements one or more of sub-unitary operations of the multiple sub-unitary operations.
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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
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.
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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
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.
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