Riverlane Ltd.

Luka Skoric

Earl Terence Campbell

Kauser Yakub Johar

Ben Andrew Barber

Kenton Michael Barnes

A method and apparatus for decoding syndromes of a quantum error correction code is disclosed. The method includes the steps of receiving syndrome data for a plurality of quantum error correction rounds performed on a plurality of qubits; identifying a plurality of first blocks within the syndrome data, wherein each first block has a respective first central block surrounded by one or more respective first buffer blocks; decoding each first block to obtain a first committed correction for each respective first central block; identifying a plurality of second blocks within the syndrome data, wherein each second block comprises at least part of at least one first buffer block; and decoding each second block to obtain a second committed correction for each second block. An apparatus including a plurality of block decoders and a process manager is disclosed.

Quantum computing decoder and associated methods

A decoder apparatus for decoding syndromes of a quantum error correction code, the syndromes comprising measurement data from a quantum computer, the quantum computer comprising an array of qubits including syndrome qubits and data qubits. The decoder apparatus is configured to: receive syndrome index data representative of: a physical location of each of the array of qubits within the quantum computer; and lattice dimensions of the array of qubits; receive the syndromes of the quantum error correction code from the quantum computer; determine physical co-ordinate positions for each of the array of qubits based on the syndrome index data; decode the syndromes of the quantum error correction code using the determined physical co-ordinate positions. The decoder apparatus has a first syndrome capacity for decoding quantum error correction code syndromes and the syndromes of the quantum error correction code occupy a second syndrome capacity less than or equal to the first syndrome capacity of the decoder apparatus.

Quantum error correction code decoder and associated methods

A computer-implemented method for decoding syndromes of a quantum error correction code, the syndromes comprising measurement data from a quantum computer, the method comprising: receiving syndrome measurement data comprising a plurality of quantum error correction rounds performed on a plurality of qubits; identifying a plurality of non-overlapping first blocks within the syndrome measurement data, wherein: each first block has: a first central block of quantum error corrections rounds; and a first buffer block of quantum error correction rounds, wherein the first buffer block surrounds the first central block, and each first block is surrounded by an interstitial region of quantum error correction rounds; identifying the location of a first set of errors in the plurality of qubits by decoding each first block to provide respective decoded first central blocks and respective decoded first buffer blocks; outputting the location of the first set of errors contained within each decoded first central block.

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Cambridge, United Kingdom

Luka Skoric