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    Short-depth syndrome extraction circuits in 2D quantum architectures for hypergraph product codes
    5.
    发明授权
    Short-depth syndrome extraction circuits in 2D quantum architectures for hypergraph product codes 有权

    公开(公告)号：US12271784B2

    公开(公告)日：2025-04-08

    申请号：US17219331

    申请日：2021-03-31

    Applicant: Microsoft Technology Licensing, LLC

    Inventor： Nicolas Guillaume Delfosse ,  Maxime Tremblay ,  Michael Edward Beverland

    IPC: G06N10/70 ,  G06F11/10 ,  G06F16/901

    Abstract: A quantum measurement circuit implements a hypergraph product code (HPG). A syndrome can be extracted from the circuit by preparing a readout qubit of the quantum measurement circuit in a known state, preparing a row-based measurement gadget, and preparing a column-based measurement gadget in the quantum measurement circuit. The row-based measurement gadget entangles the readout qubit with a first subset of the target set of data qubits in a same row of the quantum measurement circuit as the readout qubit, and the column based gadget entangles the readout qubit with a second subset of the target set of data qubits in a same column of the quantum measurement circuit as the readout qubit. The syndrome is extracted by measuring the readout qubit to extract the parity of the target set of data qubits.

    Fault correction for Clifford circuits
    6.
    发明授权
    Fault correction for Clifford circuits 有权

    公开(公告)号：US12112240B2

    公开(公告)日：2024-10-08

    申请号：US17820701

    申请日：2022-08-18

    Applicant: Microsoft Technology Licensing, LLC

    Inventor： Nicolas Guillaume Delfosse ,  Adam Edward Paetznick

    IPC: G06N10/70 ,  H03M13/00 ,  H03M13/15

    CPC classification number: G06N10/70 ,  H03M13/159 ,  H03M13/611

    Abstract: A method to correct a fault in application of a Clifford circuit to a qubit register of a quantum computer comprises: (A) receiving circuit data defining the Clifford circuit; (B) emitting outcome code based on the circuit data, the outcome code including a series of outcome checks each corresponding to an anticipated error syndrome of the application of the Clifford circuit to the qubit register; and (C) emitting space-time quantum code corresponding to the Clifford circuit based on the circuit data and on the outcome code, the space-time quantum code including a series of check operators that support quantum-error correction, thereby enabling fault correction in the application of the Clifford circuit to the qubit register.

    Fault-tolerant quantum cat state preparation
    7.
    发明授权
    Fault-tolerant quantum cat state preparation 有权

    公开(公告)号：US11416761B2

    公开(公告)日：2022-08-16

    申请号：US16856274

    申请日：2020-04-23

    Applicant: Microsoft Technology Licensing, LLC

    Inventor： Nicolas Guillaume Delfosse ,  Krysta Marie Svore ,  Benjamin Walter Reichardt

    IPC: G06N10/00 ,  B82Y10/00 ,  H03K19/195

    Abstract: A quantum computing system is adapted to prepare a cat state in a quantum circuit with fault tolerance t and circuit depth less than or equal to 4+4t by performing a series of operations that includes: performing a sequence of joint parity measurements on individual pairs of neighboring qubits in a series of qubits entangled to form an initial cat state; repeating the sequence of measurements over at least t-rounds; and disentangling a first set of alternating qubits from the initial cat state, the prepared cat state being formed by a remaining second set of alternating qubits, the second set of alternating qubits being interlaced with the first set of alternating qubits along a line of one-dimensional connectivity, the series of operations being sufficient to guarantee that a prepared cat state is has less than or equal to t number of faults.

    Short-depth syndrome extraction circuits for Calderbank Shor Steane (CSS) stabilizer codes
    9.
    发明授权
    Short-depth syndrome extraction circuits for Calderbank Shor Steane (CSS) stabilizer codes 有权

    公开(公告)号：US11494684B2

    公开(公告)日：2022-11-08

    申请号：US17219383

    申请日：2021-03-31

    Applicant: Microsoft Technology Licensing, LLC

    Inventor： Nicolas Guillaume Delfosse ,  Maxime Tremblay ,  Michael Edward Beverland

    IPC: G06N10/00 ,  G06F11/10 ,  G06F11/00 ,  G06F16/901

    Abstract: A disclosed methodology for syndrome extraction in a quantum measurement circuit includes generating a graph representing a code implemented by the quantum measurement circuit. The graph includes bit nodes corresponding to data qubits in the quantum measurement circuit, check nodes corresponding to syndrome qubits in the quantum measurement circuit, and edges between the bit nodes and check nodes that are each associated with a stabilizer measurement provided by the code. The methodology provides for assigning each of the different edges in the graph to a select one of “G” number of different edge types and performing at least G-number of temporally-separated rounds of qubit operations that each enact concurrent multi-qubit operations on endpoints of a subset of the edges assigned to a same one of the G different edge types.

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