Rapid single-shot parity spin readout in a silicon double quantum dot with fidelity exceeding 99 %

• URL: http://arxiv.org/abs/2309.00225v1
• Date: Fri, 1 Sep 2023 02:59:04 GMT
• Title: Rapid single-shot parity spin readout in a silicon double quantum dot with fidelity exceeding 99 %
• Authors: Kenta Takeda, Akito Noiri, Takashi Nakajima, Leon C. Camenzind, Takashi Kobayashi, Amir Sammak, Giordano Scappucci, and Seigo Tarucha
• Abstract summary: Silicon-based spin qubits offer a potential pathway toward realizing a scalable quantum computer. Recent experiments have demonstrated crucial technologies, including high-fidelity quantum gates and multiqubit operation. The realization of a fault-tolerant quantum computer requires a high-fidelity spin measurement faster than decoherence.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Silicon-based spin qubits offer a potential pathway toward realizing a scalable quantum computer owing to their compatibility with semiconductor manufacturing technologies. Recent experiments in this system have demonstrated crucial technologies, including high-fidelity quantum gates and multiqubit operation. However, the realization of a fault-tolerant quantum computer requires a high-fidelity spin measurement faster than decoherence. To address this challenge, we characterize and optimize the initialization and measurement procedures using the parity-mode Pauli spin blockade technique. Here, we demonstrate a rapid (with a duration of a few us) and accurate (with >99% fidelity) parity spin measurement in a silicon double quantum dot. These results represent a significant step forward toward implementing measurement-based quantum error correction in silicon.

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