Feedback-based active reset of a spin qubit in silicon

• URL: http://arxiv.org/abs/2209.02259v1
• Date: Tue, 6 Sep 2022 07:17:51 GMT
• Title: Feedback-based active reset of a spin qubit in silicon
• Authors: Takashi Kobayashi (1 and 2), Takashi Nakajima (2), Kenta Takeda (2), Akito Noiri (2), Jun Yoneda (2), Seigo Tarucha (1 and 2) ((1) RIKEN Center for Quantum Computing, Wako, Saitama 351-0198, Japan, (2) Center for Emerging Matter Science, RIKEN, Wako, Saitama 351-0198, Japan)
• Abstract summary: We demonstrate active reset of a silicon spin qubit using feedback control. The active reset is based on quantum non-demolition readout of the qubit and feedback according to the readout results.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Feedback control of qubits is a highly demanded technique for advanced quantum information protocols such as 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 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 accuracy of the single QND measurement fidelity. Based on an analysis of the reset protocol, we suggest a way to achieve the initialization fidelity sufficient for the fault-tolerant quantum computation.

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