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

2024/11/25 by Kobayashi, Takashi, Noiri, Akito, Nakajima, Takashi +5 · 2 citations
#FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Quantum Physics (quant-ph)

paper · doi:10.48550/arxiv.2411.16224

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.

Cited by

• Mid-circuit logic executed in the qubit layer of a quantum processor
• Tracking spin qubit frequency variations over 912 days

Related

• Simulated Charge Stability in a MOSFET Linear Quantum Dot Array
• Impact of AC Magnetic Field on Decoherence of Quantum Dot based Single Spin Qubit System
• The origins of noise in the Zeeman splitting of spin qubits in natural-silicon devices
• Dynamic sweet spot of driven flopping-mode spin qubits in planar quantum dots
• Optimal operation of hole spin qubits