Charge-induced energy shift of a single-spin qubit under a magnetic field gradient
Akito Noiri (RIKEN Center for Emergent Matter Science (CEMS))
Takashi Nakajima (RIKEN Center for Emergent Matter Science (CEMS))
Kenta Takeda (RIKEN Center for Emergent Matter Science (CEMS))
Leon C. Camenzind (RIKEN Center for Emergent Matter Science (CEMS))
Ik Kyeong Jin (RIKEN Center for Emergent Matter Science (CEMS))
G. Scappucci (Kavli institute of nanoscience Delft, TU Delft - QCD/Scappucci Lab, TU Delft - QuTech Advanced Research Centre)
Seigo Tarucha (RIKEN Center for Emergent Matter Science (CEMS))
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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 positional 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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