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公开(公告)号：US11422890B2
公开(公告)日：2022-08-23
申请号：US16645756
申请日：2017-09-12
Applicant: Google LLC
Inventor： Austin Greig Fowler
Abstract: Methods, systems and apparatus for correcting a stream of syndrome measurements produced by a quantum computer. A layered representation of error propagation through quantum error detection circuits is received. The layered representation includes a plurality of line circuit layers that each represent a probability of local detection events in a quantum computer associated with one or more potential error processes in the execution of a quantum algorithm. During execution of the quantum algorithm, one or more syndrome measurements are received from quantum error detection circuits. The syndrome measurements are converted into detection events and written to an array that represents quantum error correction circuits that are grouped together at a sequence of steps in the quantum algorithm. Errors in the execution of the quantum algorithm are determined from the detection events in dependence upon the stored line circuit layers. Based on the determined errors, the syndrome measurements are corrected.
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公开(公告)号：US20210374588A1
公开(公告)日：2021-12-02
申请号：US16980592
申请日：2019-08-08
Applicant: Google LLC
Inventor： Craig Gidney , Austin Greig Fowler
Abstract: Methods, systems, and apparatus for performing low overhead quantum computations using lattice surgery. In one aspect, an apparatus includes a multi-qubit lattice defining a plurality of qubit rows and plurality of qubit columns, comprising: two or more separate row portions of rotated logical qubits, each row portion comprising a plurality of rotated logical qubits that are each adjacent to each other, each rotated logical qubit comprising: a plurality of data qubits, and a plurality of measure qubits; two or more separate row portions of inactive qubits, each row portion defining a plurality of inactive qubits; wherein: each row portion of rotated logical qubits is adjacent a row portion of inactive qubits.
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公开(公告)号：US20200278903A1
公开(公告)日：2020-09-03
申请号：US16645776
申请日：2017-09-13
Applicant: Google LLC
Inventor： Austin Greig Fowler
Abstract: Apparatus for quantum error correction is disclosed. The apparatus includes an array of processing cores, each processing core comprising: a processor on a first chip; and a processor cache on the first chip; and a bus for interconnecting neighbouring processing cores in the array of processing cores; wherein each processing core includes: control code which, when executed by the processor, causes the processor to access a processor cache of at least one neighbouring processing core.
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