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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2018
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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) |
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Medicine R Science Q A. Dey S. Yarlagadda Temperature dependence of long coherence times of oxide charge qubits |
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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 |