Exponential Error Suppression for Near-Term Quantum Devices

• Item type: SIG Technical Reports(1)
• 公開日: 2021-10-07
• タイトル: Exponential Error Suppression for Near-Term Quantum Devices
• タイトル / 言語: en
• タイトル: Exponential Error Suppression for Near-Term Quantum Devices
• 言語: eng
• キーワード / 主題Scheme: Other
• キーワード / 主題: 招待講演
• 資源タイプ / 資源タイプ識別子: http://purl.org/coar/resource_type/c_18gh
• 資源タイプ: technical report
• 著者所属: Department of Materials, University of Oxford
• 著者所属(英): en
• 著者所属(英): Department of Materials, University of Oxford
• 著者名: Bálint, Koczor
• 著者名(英): Bálint, Koczor
• 論文抄録 / 内容記述タイプ: Other
• 論文抄録 / 内容記述: Suppressing noise in physical systems is of fundamental importance. As quantum computers mature, quantum error correcting codes will be adopted in order to suppress errors to any desired level. However in the NISQ era, the complexity and scale required to adopt even the smallest QEC is prohibitive: a single logical qubit needs to be encoded into many thousands of physical qubits. Here we show that, for the crucial case of estimating expectation values of observables (key to almost all NISQ algorithms) one can indeed achieve an effective exponential suppression. We take n independently-prepared circuit outputs to create a state whose symmetries prevent errors from contributing bias to the expected value. The approach is very well suited for current and near-term quantum devices as it is modular in the main computation and requires only a shallow circuit that bridges the n copies immediately prior to measurement. Using no more than 4 circuit copies, we confirm error suppression below 10-6 for circuits consisting of several hundred noisy gates (two-qubit gate error 0.5%) in numerical simulations validating our approach.
• 論文抄録(英) / 内容記述タイプ: Other
• 論文抄録(英) / 内容記述: Suppressing noise in physical systems is of fundamental importance. As quantum computers mature, quantum error correcting codes will be adopted in order to suppress errors to any desired level. However in the NISQ era, the complexity and scale required to adopt even the smallest QEC is prohibitive: a single logical qubit needs to be encoded into many thousands of physical qubits. Here we show that, for the crucial case of estimating expectation values of observables (key to almost all NISQ algorithms) one can indeed achieve an effective exponential suppression. We take n independently-prepared circuit outputs to create a state whose symmetries prevent errors from contributing bias to the expected value. The approach is very well suited for current and near-term quantum devices as it is modular in the main computation and requires only a shallow circuit that bridges the n copies immediately prior to measurement. Using no more than 4 circuit copies, we confirm error suppression below 10-6 for circuits consisting of several hundred noisy gates (two-qubit gate error 0.5%) in numerical simulations validating our approach.
• 書誌レコードID / 収録物識別子タイプ: NCID
• 書誌レコードID / 収録物識別子: AA12894105
• 書誌情報: 量子ソフトウェア（QS）; 巻 2021-QS-4, 号 7, p. 1-1, 発行日 2021-10-07
• ISSN / 収録物識別子タイプ: ISSN
• ISSN / 収録物識別子: 2435-6492
• Notice: SIG Technical Reports are nonrefereed and hence may later appear in any journals, conferences, symposia, etc.
• 出版者 / 言語: ja
• 出版者: 情報処理学会