Quantum dot state initialization by control of tunneling rates

We study the loading of electrons into a quantum dot with dynamically controlled tunnel barriers. We introduce a method to measure tunneling rates for individual discrete states and to identify their relaxation paths. Exponential selectivity of the tunnel coupling enables loading into specific quant...

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Bibliographic Details
Published in:arXiv.org 2019-03
Main Authors: Wenz, Tobias, Klochan, Jevgeny, Hohls, Frank, Gerster, Thomas, Kashcheyevs, Vyacheslavs, Schumacher, Hans W
Format: Article
Language:English
Subjects:
Electrons
Quantum dots
Selectivity
Single electrons
Online Access:Get full text
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Summary:We study the loading of electrons into a quantum dot with dynamically controlled tunnel barriers. We introduce a method to measure tunneling rates for individual discrete states and to identify their relaxation paths. Exponential selectivity of the tunnel coupling enables loading into specific quantum dot states by tuning independently energy and rates. While for the single-electron case orbital relaxation leads to fast transition into the ground state, for electron pairs triplet-to-singlet relaxation is suppressed by long spin-flip times. This enables the fast gate-controlled initialization of either a singlet or a triplet electron pair state in a quantum dot with broad potential applications in quantum technologies.
ISSN:2331-8422
DOI:10.48550/arxiv.1903.02395