The quantum Zeno and anti-Zeno effects with strong system-environment coupling

To date, studies of the quantum Zeno and anti-Zeno effects focus on quantum systems that are weakly interacting with their environment. In this paper, we investigate what happens to a quantum system under the action of repeated measurements if the quantum system is strongly interacting with its envi...

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Autor principal:	Adam Zaman Chaudhry
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/34a2fb89a326499994e3ba18bd39fa57
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spelling	oai:doaj.org-article:34a2fb89a326499994e3ba18bd39fa572021-12-02T16:06:17ZThe quantum Zeno and anti-Zeno effects with strong system-environment coupling10.1038/s41598-017-01844-82045-2322https://doaj.org/article/34a2fb89a326499994e3ba18bd39fa572017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-01844-8https://doaj.org/toc/2045-2322To date, studies of the quantum Zeno and anti-Zeno effects focus on quantum systems that are weakly interacting with their environment. In this paper, we investigate what happens to a quantum system under the action of repeated measurements if the quantum system is strongly interacting with its environment. We consider as the quantum system a single two-level system coupled strongly to a collection of harmonic oscillators. A so-called polaron transformation is then used to make the problem in the strong system-environment coupling regime tractable. We find that the strong coupling case exhibits quantitative and qualitative differences as compared with the weak coupling case. In particular, the effective decay rate does not depend linearly on the spectral density of the environment. This then means that, in the strong coupling regime that we investigate, increasing the system-environment coupling strength can actually decrease the effective decay rate. We also consider a collection of two-level atoms coupled strongly with a common environment. In this case, we find that there are further differences between the weak and strong coupling cases since the two-level atoms can now indirectly interact with one another due to the common environment.Adam Zaman ChaudhryNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-11 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Adam Zaman Chaudhry The quantum Zeno and anti-Zeno effects with strong system-environment coupling
description	To date, studies of the quantum Zeno and anti-Zeno effects focus on quantum systems that are weakly interacting with their environment. In this paper, we investigate what happens to a quantum system under the action of repeated measurements if the quantum system is strongly interacting with its environment. We consider as the quantum system a single two-level system coupled strongly to a collection of harmonic oscillators. A so-called polaron transformation is then used to make the problem in the strong system-environment coupling regime tractable. We find that the strong coupling case exhibits quantitative and qualitative differences as compared with the weak coupling case. In particular, the effective decay rate does not depend linearly on the spectral density of the environment. This then means that, in the strong coupling regime that we investigate, increasing the system-environment coupling strength can actually decrease the effective decay rate. We also consider a collection of two-level atoms coupled strongly with a common environment. In this case, we find that there are further differences between the weak and strong coupling cases since the two-level atoms can now indirectly interact with one another due to the common environment.
format	article
author	Adam Zaman Chaudhry
author_facet	Adam Zaman Chaudhry
author_sort	Adam Zaman Chaudhry
title	The quantum Zeno and anti-Zeno effects with strong system-environment coupling
title_short	The quantum Zeno and anti-Zeno effects with strong system-environment coupling
title_full	The quantum Zeno and anti-Zeno effects with strong system-environment coupling
title_fullStr	The quantum Zeno and anti-Zeno effects with strong system-environment coupling
title_full_unstemmed	The quantum Zeno and anti-Zeno effects with strong system-environment coupling
title_sort	quantum zeno and anti-zeno effects with strong system-environment coupling
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/34a2fb89a326499994e3ba18bd39fa57
work_keys_str_mv	AT adamzamanchaudhry thequantumzenoandantizenoeffectswithstrongsystemenvironmentcoupling AT adamzamanchaudhry quantumzenoandantizenoeffectswithstrongsystemenvironmentcoupling
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The quantum Zeno and anti-Zeno effects with strong system-environment coupling

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