Charge-induced energy shift of a single-spin qubit under a magnetic-field gradient

• URL: http://arxiv.org/abs/2411.16224v1
• Date: Mon, 25 Nov 2024 09:34:50 GMT
• Title: Charge-induced energy shift of a single-spin qubit under a magnetic-field gradient
• Authors: Takashi Kobayashi, Akito Noiri, Takashi Nakajima, Kenta Takeda, Leon C. Camenzind, Ik Kyeong Jin, Giordano Scappucci, Seigo Tarucha,
• Abstract summary: An electron confined by a semiconductor quantum dot (QD) can be displaced by changes in electron occupations of surrounding QDs. For a single-spin qubit in an inhomogeneous magnetic field, such a displacement of the host electron results in a qubit energy shift. We spectroscopically investigate the qubit energy shift induced by changes in charge occupations of nearby QDs for a silicon single-spin qubit in a magnetic-field gradient.
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• Abstract: An electron confined by a semiconductor quantum dot (QD) can be displaced by changes in electron occupations of surrounding QDs owing to the Coulomb interaction. For a single-spin qubit in an inhomogeneous magnetic field, such a displacement of the host electron results in a qubit energy shift which must be handled carefully for high-fidelity operations. Here we spectroscopically investigate the qubit energy shift induced by changes in charge occupations of nearby QDs for a silicon single-spin qubit in a magnetic-field gradient. Between two different charge configurations of an adjacent double QD, a spin qubit shows an energy shift of about 4 MHz, which necessitates strict management of electron positions over a QD array. We confirm a correlation between the qubit frequency and the charge configuration by using a postselection analysis.

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