Single spin qubit geometric gate in a silicon quantum dot

• DOI: 10.48550/arxiv.2310.06569
• Publication Date: 2023-01-01
• Authors: Rong-Long Ma; Ao-Ran Li; Chu Wang; Zhenzhen Kong; Wei-Zhu Liao; Ming Ni; Sheng-Kai Zhu; Ning Chu; Cheng-Xian Zhang; Di Liu; Gang Cao; Guilei Wang; Hai-Ou Li; Guo‐Ping Guo
• Keywords: Controlled NOT gate; Dephasing; Coherent control

Preserving qubit coherence and maintaining high-fidelity control under complex noise environment is an enduring challenge for scalable quantum computing. Here we demonstrate addressable fault-tolerant single spin with average fidelity of 99.12% via randomized benchmarking on a silicon dot device integrated micromagnet. Its dephasing time T2* 1.025 us can be enlarged to 264 by using the Hahn echo technique, reflecting strong low-frequency in our system. To break through limitation, introduce geometric computing obtain high exploiting its noise-resilient feature. However, fidelities gates are lower than 99%. According simulation, feature masked heating effect. With further optimization alleviate effect, potential approach reproducibly achieving environment.