articleNatureMar 22, 2023HYBRID OA

Beating the break-even point with a discrete-variable-encoded logical qubit

ZNZhongchu NiSLSai LiXDXiaowei DengYCYanyan CaiLZLibo Zhang

Southern University of Science and Technology · Tsinghua University · +5 more institutions

PubMed
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Abstract

Abstract Quantum error correction (QEC) aims to protect logical qubits from noises by using the redundancy of a large Hilbert space, which allows errors to be detected and corrected in real time 1 . In most QEC codes 2–8 , a logical qubit is encoded in some discrete variables, for example photon numbers, so that the encoded quantum information can be unambiguously extracted after processing. Over the past decade, repetitive QEC has been demonstrated with various discrete-variable-encoded scenarios 9–17 . However, extending the lifetimes of thus-encoded logical qubits beyond the best available physical qubit still remains elusive, which represents a break-even point for judging the practical usefulness of QEC.…

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Topics & keywords

Topics
Keywords
  • Qubit
  • Quantum error correction
  • Quantum computer
  • Computer science
  • Topology (electrical circuits)
  • Error detection and correction
  • Redundancy (engineering)
  • Flux qubit
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