Kavli Affiliate: Giordano Scappucci
| First 5 Authors: Takashi Kobayashi, Akito Noiri, Takashi Nakajima, Kenta Takeda, Leon C. Camenzind
| Summary:
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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