Three individual two-axis control of singlet-triplet qubits in a micromagnet integrated quantum dot array

We report individual confinement and two-axis qubit operations of two electron spin qubits in GaAs gate-defined sextuple quantum dot array with integrated micro-magnet. As a first step toward multiple qubit operations, we demonstrate coherent manipulations of three singlet-triplet qubits showing und...

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Bibliographic Details
Published in:arXiv.org 2020-10
Main Authors: Jang, Wonjin, Cho, Min-Kyun, Kim, Jehyun, Chung, Hwanchul, Umansky, Vladimir, Kim, Dohun
Format: Article
Language:English
Subjects:
Adequacy
Electron spin
Linear arrays
Quantum dots
Qubits (quantum computing)
Online Access:Get full text
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Summary:We report individual confinement and two-axis qubit operations of two electron spin qubits in GaAs gate-defined sextuple quantum dot array with integrated micro-magnet. As a first step toward multiple qubit operations, we demonstrate coherent manipulations of three singlet-triplet qubits showing underdamped Larmor and Ramsey oscillations in all double dot sites. We provide an accurate measure of site site-dependent field gradients and rms electric and magnetic noise, and we discuss the adequacy of simple rectangular micro-magnet for practical use in multiple quantum dot arrays. We also discuss current limitations and possible strategies for realizing simultaneous multi multi-qubit operations in extended linear arrays.
ISSN:2331-8422
DOI:10.48550/arxiv.2009.13182