Coherence of a driven electron spin qubit actively decoupled from quasi-static noise

• URL: http://arxiv.org/abs/2001.02884v2
• Date: Fri, 13 Mar 2020 11:15:05 GMT
• Title: Coherence of a driven electron spin qubit actively decoupled from quasi-static noise
• Authors: Takashi Nakajima, Akito Noiri, Kento Kawasaki, Jun Yoneda, Peter Stano, Shinichi Amaha, Tomohiro Otsuka, Kenta Takeda, Matthieu R. Delbecq, Giles Allison, Arne Ludwig, Andreas D. Wieck, Daniel Loss and Seigo Tarucha
• Abstract summary: Coherence of electron spin qubits in semiconductor quantum dots suffers mostly from low-frequency noise. We demonstrate an electron spin qubit whose coherence in the driven evolution is limited by high-frequency charge noise.
• Score: 0.4065594766856674
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The coherence of electron spin qubits in semiconductor quantum dots suffers mostly from low-frequency noise. During the last decade, efforts have been devoted to mitigate such noise by material engineering, leading to substantial enhancement of the spin dephasing time for an idling qubit. However, the role of the environmental noise during spin manipulation, which determines the control fidelity, is less understood. We demonstrate an electron spin qubit whose coherence in the driven evolution is limited by high-frequency charge noise rather than the quasi-static noise inherent to any semiconductor device. We employed a feedback control technique to actively suppress the latter, demonstrating a $\pi$-flip gate fidelity as high as $99.04\pm 0.23\,\%$ in a gallium arsenide quantum dot. We show that the driven-evolution coherence is limited by the longitudinal noise at the Rabi frequency, whose spectrum resembles the $1/f$ noise observed in isotopically purified silicon qubits.

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