ENHANCED DECODING OF QUANTUM ERROR CORRECTION CODES WITH IN-PHASE AND QUADRATURE INFORMATION

    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

    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.

    LOCAL PRE-MATCHING PASS FOR CORRELATED DECODING OF QUANTUM ERROR CORRECTING CODES

    公开(公告)号:US20250165844A1

    公开(公告)日:2025-05-22

    申请号:US18750997

    申请日:2024-06-21

    Applicant: Google LLC

    Abstract: Methods, systems, and apparatus for predicting an occurrence of errors in a quantum computation. In one aspect, a method includes updating edge weights of a second quantum error correction detector graph by performing a local search of a first quantum error correction detector graph, wherein performing the local search comprises, for each detection event in the first quantum error correction detector graph, reweighting complementary edges in the second quantum error correction detector graph using single-edge errors on an edge that connects the detection event to a nearest other detection event; and executing a decoding process on the second quantum error correction detector graph to compute a decoding output of the decoding process, wherein the decoding output predicts the occurrence of errors in the quantum computation.

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