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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2411.16224 |
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| _version_ | 1866909942166847488 |
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| author | Kobayashi, Takashi Noiri, Akito Nakajima, Takashi Takeda, Kenta Camenzind, Leon C. Jin, Ik Kyeong Scappucci, Giordano Tarucha, Seigo |
| author_facet | Kobayashi, Takashi Noiri, Akito Nakajima, Takashi Takeda, Kenta Camenzind, Leon C. Jin, Ik Kyeong Scappucci, Giordano Tarucha, Seigo |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_16224 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Charge-induced energy shift of a single-spin qubit under a magnetic-field gradient Kobayashi, Takashi Noiri, Akito Nakajima, Takashi Takeda, Kenta Camenzind, Leon C. Jin, Ik Kyeong Scappucci, Giordano Tarucha, Seigo Mesoscale and Nanoscale Physics Quantum Physics 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. |
| title | Charge-induced energy shift of a single-spin qubit under a magnetic-field gradient |
| topic | Mesoscale and Nanoscale Physics Quantum Physics |
| url | https://arxiv.org/abs/2411.16224 |