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.
@article{arxiv.2309.00225,
title = {Rapid single-shot parity spin readout in a silicon double quantum dot with fidelity exceeding 99 %},
author = {Kenta Takeda and Akito Noiri and Takashi Nakajima and Leon C. Camenzind and Takashi Kobayashi and Amir Sammak and Giordano Scappucci and Seigo Tarucha},
journal= {arXiv preprint arXiv:2309.00225},
year = {2024}
}