Feedback-based active reset of a spin qubit in silicon
Feedback-based active reset of a spin qubit in silicon
复制标题
硅中自旋量子位的基于反馈的主动复位
作者：
Takashi Kobayashi;Takashi Nakajima;K. Takeda;A. Noiri;J. Yoneda;Seigo Tarucha Riken Center for Quantum Computing;Wako;Saitama 351;Japan;Center for Emerging Matter Science;Riken
量子比特的反馈控制是容错量子纠错等高级量子信息协议的关键技术。在这里，我们演示了使用反馈控制的硅自旋量子比特的主动重置。主动重置基于量子比特的量子非破坏(QND)读出和根据读出结果的反馈，这是通过硬件数据处理和排序实现的。我们将累积读出技术结合到主动重置协议中，提高了初始化保真度，超过了单次QND读出保真度所施加的限制。对重置协议的分析暗示了一条实现足以容错量子计算的初始化保真度的途径。这些结果为在现实设备中进行高保真的量子比特操作提供了一种实用的方法。
Feedback control of qubits is a highly demanded technique for advanced quantum information protocols such as fault-tolerant quantum error correction. Here we demonstrate active reset of a silicon spin qubit using feedback control. The active reset is based on quantum non-demolition (QND) readout of the qubit and feedback according to the readout results, which is enabled by hardware data processing and sequencing. We incorporate a cumulative readout technique to the active reset protocol, enhancing initialization fidelity above a limitation imposed by the single-shot QND readout fidelity. An analysis of the reset protocol implies a pathway to achieve the initialization fidelity sufficient for fault-tolerant quantum computation. These results provide a practical approach to high-fidelity qubit operations in realistic devices.
影响因子：
8.6
作者：
S. Brakhane;W. Alt;T. Kampschulte;M. Martinez-Dorantes;R. Reimann;Seokchan Yoon;A. Widera;D. Meschede
通讯作者：
S. Brakhane;W. Alt;T. Kampschulte;M. Martinez-Dorantes;R. Reimann;Seokchan Yoon;A. Widera;D. Meschede