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Experimental deterministic correction of qubitloss

机译：qubitloss的实验确定性校正

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摘要

The successful operation of quantum computers relies on protecting qubits from decoherence and noise, which-if uncorrected-will lead to erroneous results. Because these errors accumulate during an algorithm, correcting them is a key requirement for large-scale and fault-tolerant quantum information processors. Besides computational errors, which can be addressed by quantum error correction~(1-9), the carrier of the information can also be completely lost or the information can leak out of the computational space~(10-14). It is expected that such loss errors will occur at rates that are comparable to those of computational errors. Here we experimentally implement a full cycle of qubit loss detection and correction on a minimal instance of a topological surface code~(15,16)in a trapped-ion quantum processor. The key technique used for this correction is a quantum non-demolition measurement performed via an ancillary qubit, which acts as a minimally invasive probe that detects absent qubits while imparting the smallest quantum mechanically possible disturbance to the remaining qubits. Upon detecting qubit loss, a recovery procedure is triggered in real time that maps the logical information onto a new encoding on the remaining qubits. Although the current demonstration is performed in a trapped-ion quantum processor~(17), the protocol is applicable to other quantum computing architectures and error correcting codes, including leading two- and three-dimensional topological codes. These deterministic methods provide a complete toolbox for the correction of qubit loss that, together with techniques that mitigate computational errors, constitute the building blocks of complete and scalable quantum error correction.
机译：量子计算机的成功运行依赖于保护Qubits免受脱机和噪声，这 - 如果未校正 - 将导致错误的结果。由于这些错误在算法期间累积，因此纠正它们是大规模和容错量子信息处理器的关键要求。除了通过量子误差校正〜（1-9）寻址的计算错误之外，信息的载波也可以完全丢失，或者信息可以从计算空间泄漏〜（10-14）。预计此类损失误差将以与计算误差相当的速率发生。在这里，我们通过实验在捕获离子量子处理器中对拓扑表面代码〜（15,16）的最小实例进行了全周期的Qubit损失检测和校正。用于该校正的关键技术是经由辅助QUBET执行的量子非拆卸测量，其用作最微创探针，其检测不存在QUBITS，同时赋予对剩余额度的最小量子机械地可能的干扰。在检测QUBBit损失时，将恢复过程实时触发，将逻辑信息映射到剩余QUBITS上的新编码上。尽管当前演示在捕获离子量子处理器〜（17）中进行，但是该协议适用于其他量子计算架构和纠错码，包括前导的二维和三维拓扑代码。这些确定性方法提供了一个完整的工具箱，用于校正量子位损失，与减轻计算错误的技术一起构成完整和可伸缩量子误差校正的构建块。

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  • 来源
    《Nature》 |2020年第7824期|207-210|共4页
  • 作者

    Roman Stricker; Davide Vodola; Alexander Erhard; Lukas Postler; Michael Meth; Martin Ringbauer; Philipp Schindler; Thomas Monz; Markus Müller; Rainer Blatt;

  • 作者单位

    Institut für Experimentalphysik Universität Innsbruck;

    Dipartimento di Fisica e Astronomia dell'Università di Bologna|INFN Sezione di Bologna|Department of Physics College of Science Swansea University;

    Institut für Experimentalphysik Universität Innsbruck;

    Institut für Experimentalphysik Universität Innsbruck;

    Institut für Experimentalphysik Universität Innsbruck;

    Institut für Experimentalphysik Universität Innsbruck;

    Institut für Experimentalphysik Universität Innsbruck;

    Institut für Experimentalphysik Universität Innsbruck|Alpine Quantum Technologies GmbH;

    Department of Physics College of Science Swansea University|Institute for Quantum Information RWTH Aachen University|Theoretical Nanoelectronics Peter Grünberg Institute Forschungszentrum Jülich;

    Institut für Experimentalphysik Universität Innsbruck|Institut für Quantenoptik und Quanteninformation Österreichische Akademie der Wissenschaften;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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