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公开(公告)号：US11928586B2
公开(公告)日：2024-03-12
申请号：US16962059
申请日：2018-01-31
Applicant: Google LLC
Inventor： Yuezhen Niu , Hartmut Neven , Vadim Smelyanskiy , Sergio Boixo Castrillo
Abstract: Methods, systems, and apparatus for designing a quantum control trajectory for implementing a quantum gate using quantum hardware. In one aspect, a method includes the actions of representing the quantum gate as a sequence of control actions and applying a reinforcement learning model to iteratively adjust each control action in the sequence of control actions to determine a quantum control trajectory that implements the quantum gate and reduces leakage, infidelity and total runtime of the quantum gate to improve its robustness of performance against control noise during the iterative adjustments.
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公开(公告)号：US20210390442A1
公开(公告)日：2021-12-16
申请号：US16981606
申请日：2019-01-31
Applicant: Google LLC
Inventor： Yuezhen Niu , Vadim Smelyanskiy , Sergio Boixo Castrillo
Abstract: Methods, systems and apparatus for implementing a quantum gate on a quantum system comprising a second qubit coupled to a first qubit and a third qubit. In one aspect, a method includes evolving a state of the quantum system for a predetermined time, wherein during evolving: the ground and first excited state of the second qubit are separated by a first energy gap ω; the first and second excited state of the second qubit are separated by a second energy gap equal to a first multiple of ω minus qubit anharmoniticity−; the ground and first excited state of the first qubit and third qubit are separated by a third energy gap equal to ω−; and the first and second excited state of the first qubit and third qubit are separated by a fourth energy gap equal to the first multiple of the ω minus a second multiple of .
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公开(公告)号：US11055627B2
公开(公告)日：2021-07-06
申请号：US16961388
申请日：2018-01-31
Applicant: Google LLC
Inventor： Yuezhen Niu , Hartmut Neven , Vadim Smelyanskiy , Sergio Boixo Castrillo
Abstract: Methods, systems, and apparatus for implementing a unitary quantum gate on one or more qubits. In one aspect, a method includes the actions designing a control pulse for the unitary quantum gate, comprising: defining a universal quantum control cost function, wherein the control cost function comprises a qubit leakage penalty term representing i) coherent qubit leakage, and ii) incoherent qubit leakage across all frequency components during a time dependent Hamiltonian evolution that realizes the unitary quantum gate; adjusting parameters of the time dependent Hamiltonian evolution to vary a control cost according to the control cost function such that leakage errors are reduced; generating the control pulse using the adjusted parameters; and applying the control pulse to the one or more qubits to implement the unitary quantum gate.
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公开(公告)号：US20250068954A1
公开(公告)日：2025-02-27
申请号：US18237323
申请日：2023-08-23
Applicant: Google LLC
Inventor： Andrew W. Senior , Francisco Javier Hernandez Heras , Thomas Bastian Edlich , Alexander James Davies , Johannes Karl Richard Bausch , Yuezhen Niu
IPC: G06N10/70 , G06F11/07 , G06N3/0455 , G06N10/40
Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for detecting errors in a computation performed by a quantum computer. In one aspect, a method comprises obtaining error correction data for each of a plurality of time steps during the computation; initializing a decoder state; and for each of a plurality of updating time steps, wherein each updating time step corresponds to one or more of the time steps: generating an intermediate representation; and processing a time step input through a Transformer neural network to update the decoder state for the updating time step. The method comprises generating a prediction of whether an error occurred in the computation from the decoder state for the last updating time step of the plurality of updating time steps.
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Patent Agency Ranking
公开(公告)号：US20250068953A1
公开(公告)日：2025-02-27
申请号：US18237204
申请日：2023-08-23
Applicant: Google LLC
Inventor： Andrew W. Senior , Francisco Javier Hernandez Heras , Thomas Bastian Edlich , Alexander James Davies , Johannes Karl Richard Bausch , Yuezhen Niu
IPC: G06N10/70
Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for detecting errors in a computation performed by a quantum computer. In one aspect, a method comprises obtaining error correction data for each of a plurality of time steps during the computation; initializing a decoder state; and for each of the plurality of time steps: generating an intermediate representation; and processing a time step input through a Transformer neural network to update the decoder state for the time step. The method comprises generating a prediction of whether an error occurred in the computation from the decoder state for the last time step of the plurality of time steps.
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公开(公告)号：US12131226B2
公开(公告)日：2024-10-29
申请号：US18311746
申请日：2023-05-03
Applicant: Google LLC
Inventor： Yuezhen Niu , Hartmut Neven , Vadim Smelyanskiy , Sergio Boixo Castrillo
Abstract: Methods, systems, and apparatus for implementing a unitary quantum gate on one or more qubits. In one aspect, a method includes the actions designing a control pulse for the unitary quantum gate, comprising: defining a universal quantum control cost function, wherein the control cost function comprises a qubit leakage penalty term representing i) coherent qubit leakage, and ii) incoherent qubit leakage across all frequency components during a time dependent Hamiltonian evolution that realizes the unitary quantum gate; adjusting parameters of the time dependent Hamiltonian evolution to vary a control cost according to the control cost function such that leakage errors are reduced; generating the control pulse using the adjusted parameters; and applying the control pulse to the one or more qubits to implement the unitary quantum gate.
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公开(公告)号：US20240354626A1
公开(公告)日：2024-10-24
申请号：US18156063
申请日：2023-01-18
Applicant: Google LLC
Inventor： Paul Victor Klimov , Trond Ikdahl Andersen , Yuezhen Niu , Vadim Smelyanskiy
Abstract: Systems and methods for operating a quantum computing system are provided. In some examples, a method may include obtaining characterization data associated with an operating parameter of a qubit in a quantum computing system. The method may include implementing an unsupervised learning operation to extract one or more anomalies from the characterization data. The method may include operating the qubit in the quantum computing system based at least in part on the one or more anomalies.
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公开(公告)号：US20240177038A1
公开(公告)日：2024-05-30
申请号：US18319947
申请日：2023-05-18
Applicant: Google LLC
Inventor： Yuezhen Niu , Vadim Smelyanskiy , Yulong Dong
Abstract: Methods for calibrating a quantum circuit including a tunable quantum gate and a composite quantum gate characterized by a set of gate parameters are disclosed. For each modulation angle of a set of modulation angles, the quantum circuit is operated on a qubit pair for a plurality of gate cycles by tuning the tunable quantum gate. Gate characterization data is generated based on measurements of the qubit pair. A first representation of a state-transition probability vector is determined for the qubit pair based on the gate characterization data. Values for the gate parameters are transformed into orthogonal bases of parameters and are determined independently from each other based on the set of coefficients and statistical estimators. The method significantly boosts the accuracy of gate parameter learning by providing such separation between parameters and thus reduces unwanted error from one gate parameter to the other.
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公开(公告)号：US20230274172A1
公开(公告)日：2023-08-31
申请号：US18311746
申请日：2023-05-03
Applicant: Google LLC
Inventor： Yuezhen Niu , Hartmut Niu , Vadim Smelyanskiy , Sergio Boixo Castrillo
Abstract: Methods, systems, and apparatus for implementing a unitary quantum gate on one or more qubits. In one aspect, a method includes the actions designing a control pulse for the unitary quantum gate, comprising: defining a universal quantum control cost function, wherein the control cost function comprises a qubit leakage penalty term representing i) coherent qubit leakage, and ii) incoherent qubit leakage across all frequency components during a time dependent Hamiltonian evolution that realizes the unitary quantum gate; adjusting parameters of the time dependent Hamiltonian evolution to vary a control cost according to the control cost function such that leakage errors are reduced; generating the control pulse using the adjusted parameters; and applying the control pulse to the one or more qubits to implement the unitary quantum gate.
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