Quantum speed limit based on the bound of Bures angle

Abstract In this paper, we investigate the unified bound of quantum speed limit time in open systems based on the modified Bures angle. This bound is applied to the damped Jaynes-Cummings model and the dephasing model, and the analytical quantum speed limit time is obtained for both models. As an ex...

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Autores principales:	Shao-xiong Wu, Chang-shui Yu
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/b71e652c8b3c478ea14fc0fdeeb25fb8
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spelling	oai:doaj.org-article:b71e652c8b3c478ea14fc0fdeeb25fb82021-12-02T17:04:37ZQuantum speed limit based on the bound of Bures angle10.1038/s41598-020-62409-w2045-2322https://doaj.org/article/b71e652c8b3c478ea14fc0fdeeb25fb82020-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-62409-whttps://doaj.org/toc/2045-2322Abstract In this paper, we investigate the unified bound of quantum speed limit time in open systems based on the modified Bures angle. This bound is applied to the damped Jaynes-Cummings model and the dephasing model, and the analytical quantum speed limit time is obtained for both models. As an example, the maximum coherent qubit state with white noise is chosen as the initial states for the damped Jaynes-Cummings model. It is found that the quantum speed limit time in both the non-Markovian and the Markovian regimes can be decreased by the white noise compared with the pure state. In addition, for the dephasing model, we find that the quantum speed limit time is not only related to the coherence of initial state and non-Markovianity, but also dependent on the population of initial excited state.Shao-xiong WuChang-shui YuNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-8 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Shao-xiong Wu Chang-shui Yu Quantum speed limit based on the bound of Bures angle
description	Abstract In this paper, we investigate the unified bound of quantum speed limit time in open systems based on the modified Bures angle. This bound is applied to the damped Jaynes-Cummings model and the dephasing model, and the analytical quantum speed limit time is obtained for both models. As an example, the maximum coherent qubit state with white noise is chosen as the initial states for the damped Jaynes-Cummings model. It is found that the quantum speed limit time in both the non-Markovian and the Markovian regimes can be decreased by the white noise compared with the pure state. In addition, for the dephasing model, we find that the quantum speed limit time is not only related to the coherence of initial state and non-Markovianity, but also dependent on the population of initial excited state.
format	article
author	Shao-xiong Wu Chang-shui Yu
author_facet	Shao-xiong Wu Chang-shui Yu
author_sort	Shao-xiong Wu
title	Quantum speed limit based on the bound of Bures angle
title_short	Quantum speed limit based on the bound of Bures angle
title_full	Quantum speed limit based on the bound of Bures angle
title_fullStr	Quantum speed limit based on the bound of Bures angle
title_full_unstemmed	Quantum speed limit based on the bound of Bures angle
title_sort	quantum speed limit based on the bound of bures angle
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/b71e652c8b3c478ea14fc0fdeeb25fb8
work_keys_str_mv	AT shaoxiongwu quantumspeedlimitbasedontheboundofburesangle AT changshuiyu quantumspeedlimitbasedontheboundofburesangle
_version_	1718381870783135744

Quantum speed limit based on the bound of Bures angle

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