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20 January 2025

» arxiv » 2309.00225

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Rapid single-shot parity spin readout in a silicon double quantum dot with fidelity exceeding 99 %
Kenta Takeda ; Akito Noiri ; Takashi Nakajima ; Leon C. Camenzind ; Takashi Kobayashi ; Amir Sammak ; Giordano Scappucci ; Seigo Tarucha ;
Date:	1 Sep 2023
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.
Source:	arXiv, 2309.00225
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