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.

公开(公告)号：US20250005424A1

公开(公告)日：2025-01-02

申请号：US18758727

申请日：2024-06-28

Applicant: Google LLC

Inventor： Michael Gabriel Newman ,  Kevin Satzinger ,  Daniel Thomas Sank ,  Nathan Cody Jones

IPC: G06N10/70 ,  G06N10/60

Abstract: Methods, systems, and apparatus for enhanced decoding using in-phase and quadrature information. In one aspect, a method includes obtaining in-phase and quadrature values for multiple measurement operations in a quantum error correction code for a quantum computation; classifying measurement outcomes of the multiple measurement operations using respective in-phase and quadrature values; generating a detector graph of nodes and edges, wherein the detector graph labels detection events that occur in the classified measurement outcomes; assigning weights to the edges of the detector graph using posterior probability distributions of the classified measurement outcomes to generate a weighted detector graph; and executing a decoding process on the weighted detector graph to compute a decoding output of the decoding process, wherein the decoding output predicts an occurrence of errors in the quantum computation.

公开(公告)号：US20220358392A1

公开(公告)日：2022-11-10

申请号：US17623194

申请日：2019-10-25

Applicant: Google LLC

Inventor： Kevin Satzinger ,  Charles Neill ,  Julian Shaw Kelly ,  Andrew Dunsworth

IPC: G06N10/20 ,  G06N10/70

Abstract: Methods, systems and apparatus for benchmarking quantum computing hardware. In one aspect, a method includes defining an initial circuit configured to operate on an array of qubits, wherein the initial circuit comprises multiple instances of the two-qubit gate, wherein each instance of the two-qubit gate performs a same operation on a respective pair of neighboring qubits in the array; partitioning the initial circuit into multiple layers, wherein instances of the two-qubit gate in a respective layer can be implemented in parallel; for each of the multiple layers: constructing benchmarking circuits for the layer, wherein each benchmarking circuit for the layer comprises one or more cycles of quantum gates, each cycle comprising: the layer of instances of the two-qubit gate, and a plurality of single qubit gates; implementing the constructed benchmarking circuits to obtain experimental benchmarking data; and adjusting control parameters of the control model using the experimental benchmarking data.

公开(公告)号：US20250068955A1

公开(公告)日：2025-02-27

申请号：US18237331

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 ,  Kevin Satzinger ,  Michael Gabriel Newman

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; and processing a respective input for each of a plurality of updating time steps using one or more machine learning decoder models to generate a prediction of whether an error occurred in the computation, wherein each updating time step corresponds to one or more of the time steps and wherein the respective input for each of the plurality of updating time steps is generated from the error correction data for the corresponding one or more time steps.

公开(公告)号：US12204993B2

公开(公告)日：2025-01-21

申请号：US17623194

申请日：2019-10-25

Applicant: Google LLC

Inventor： Kevin Satzinger ,  Charles Neill ,  Julian Shaw Kelly ,  Andrew Dunsworth

IPC: G06N10/20 ,  G06N10/70

Abstract: Methods, systems and apparatus for benchmarking quantum computing hardware. In one aspect, a method includes defining an initial circuit configured to operate on an array of qubits, wherein the initial circuit comprises multiple instances of the two-qubit gate, wherein each instance of the two-qubit gate performs a same operation on a respective pair of neighboring qubits in the array; partitioning the initial circuit into multiple layers, wherein instances of the two-qubit gate in a respective layer can be implemented in parallel; for each of the multiple layers: constructing benchmarking circuits for the layer, wherein each benchmarking circuit for the layer comprises one or more cycles of quantum gates, each cycle comprising: the layer of instances of the two-qubit gate, and a plurality of single qubit gates; implementing the constructed benchmarking circuits to obtain experimental benchmarking data; and adjusting control parameters of the control model using the experimental benchmarking data.