Temperature dependence of long coherence times of oxide charge qubits

Abstract The ability to maintain coherence and control in a qubit is a major requirement for quantum computation. We show theoretically that long coherence times can be achieved at easily accessible temperatures (such as boiling point of liquid helium) in small (i.e., ~10 nanometers) charge qubits o...

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Autores principales:	A. Dey, S. Yarlagadda
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/2d59ae7b2bc0420785b1c75bd8b34691
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spelling	oai:doaj.org-article:2d59ae7b2bc0420785b1c75bd8b346912021-12-02T11:40:26ZTemperature dependence of long coherence times of oxide charge qubits10.1038/s41598-018-21767-22045-2322https://doaj.org/article/2d59ae7b2bc0420785b1c75bd8b346912018-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-21767-2https://doaj.org/toc/2045-2322Abstract The ability to maintain coherence and control in a qubit is a major requirement for quantum computation. We show theoretically that long coherence times can be achieved at easily accessible temperatures (such as boiling point of liquid helium) in small (i.e., ~10 nanometers) charge qubits of oxide double quantum dots when only optical phonons are the source of decoherence. In the regime of strong electron-phonon coupling and in the non-adiabatic region, we employ a duality transformation to make the problem tractable and analyze the dynamics through a non-Markovian quantum master equation. We find that the system decoheres after a long time, despite the fact that no energy is exchanged with the bath. Detuning the dots to a fraction of the optical phonon energy, increasing the electron-phonon coupling, reducing the adiabaticity, or decreasing the temperature enhances the coherence time.A. DeyS. YarlagaddaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-9 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q A. Dey S. Yarlagadda Temperature dependence of long coherence times of oxide charge qubits
description	Abstract The ability to maintain coherence and control in a qubit is a major requirement for quantum computation. We show theoretically that long coherence times can be achieved at easily accessible temperatures (such as boiling point of liquid helium) in small (i.e., ~10 nanometers) charge qubits of oxide double quantum dots when only optical phonons are the source of decoherence. In the regime of strong electron-phonon coupling and in the non-adiabatic region, we employ a duality transformation to make the problem tractable and analyze the dynamics through a non-Markovian quantum master equation. We find that the system decoheres after a long time, despite the fact that no energy is exchanged with the bath. Detuning the dots to a fraction of the optical phonon energy, increasing the electron-phonon coupling, reducing the adiabaticity, or decreasing the temperature enhances the coherence time.
format	article
author	A. Dey S. Yarlagadda
author_facet	A. Dey S. Yarlagadda
author_sort	A. Dey
title	Temperature dependence of long coherence times of oxide charge qubits
title_short	Temperature dependence of long coherence times of oxide charge qubits
title_full	Temperature dependence of long coherence times of oxide charge qubits
title_fullStr	Temperature dependence of long coherence times of oxide charge qubits
title_full_unstemmed	Temperature dependence of long coherence times of oxide charge qubits
title_sort	temperature dependence of long coherence times of oxide charge qubits
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/2d59ae7b2bc0420785b1c75bd8b34691
work_keys_str_mv	AT adey temperaturedependenceoflongcoherencetimesofoxidechargequbits AT syarlagadda temperaturedependenceoflongcoherencetimesofoxidechargequbits
_version_	1718395632306094080

Temperature dependence of long coherence times of oxide charge qubits

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