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Quantum anti-Zeno effect without wave function reduction
We study the measurement-induced enhancement of the spontaneous decay for a two-level subsystem, where measurements are treated as couplings between the excited state and an auxiliary state rather than the von Neumann's wave function reduction. The photon radiated in a fast decay of the atom, f...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2013
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3647171/ http://dx.doi.org/10.1038/srep01752 |
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author | Ai, Qing Xu, Dazhi Yi, Su Kofman, A. G. Sun, C. P. Nori, Franco |
author_facet | Ai, Qing Xu, Dazhi Yi, Su Kofman, A. G. Sun, C. P. Nori, Franco |
author_sort | Ai, Qing |
collection | PubMed |
description | We study the measurement-induced enhancement of the spontaneous decay for a two-level subsystem, where measurements are treated as couplings between the excited state and an auxiliary state rather than the von Neumann's wave function reduction. The photon radiated in a fast decay of the atom, from the auxiliary state to the excited state, triggers a quasi-measurement, as opposed to a projection measurement. Our use of the term “quasi-measurement” refers to a “coupling-based measurement”. Such frequent quasi-measurements result in an exponential decay of the survival probability of atomic initial state with a photon emission following each quasi-measurement. Our calculations show that the effective decay rate is of the same form as the one based on projection measurements. The survival probability of the atomic initial state obtained by tracing over all the photon states is equivalent to that of the atomic initial state with a photon emission following each quasi-measurement. |
format | Online Article Text |
id | pubmed-3647171 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2013 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-36471712013-05-13 Quantum anti-Zeno effect without wave function reduction Ai, Qing Xu, Dazhi Yi, Su Kofman, A. G. Sun, C. P. Nori, Franco Sci Rep Article We study the measurement-induced enhancement of the spontaneous decay for a two-level subsystem, where measurements are treated as couplings between the excited state and an auxiliary state rather than the von Neumann's wave function reduction. The photon radiated in a fast decay of the atom, from the auxiliary state to the excited state, triggers a quasi-measurement, as opposed to a projection measurement. Our use of the term “quasi-measurement” refers to a “coupling-based measurement”. Such frequent quasi-measurements result in an exponential decay of the survival probability of atomic initial state with a photon emission following each quasi-measurement. Our calculations show that the effective decay rate is of the same form as the one based on projection measurements. The survival probability of the atomic initial state obtained by tracing over all the photon states is equivalent to that of the atomic initial state with a photon emission following each quasi-measurement. Nature Publishing Group 2013-05-08 /pmc/articles/PMC3647171/ http://dx.doi.org/10.1038/srep01752 Text en Copyright © 2013, Macmillan Publishers Limited. All rights reserved http://creativecommons.org/licenses/by/3.0/ This work is licensed under a Creative Commons Attribution 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/3.0/ |
spellingShingle | Article Ai, Qing Xu, Dazhi Yi, Su Kofman, A. G. Sun, C. P. Nori, Franco Quantum anti-Zeno effect without wave function reduction |
title | Quantum anti-Zeno effect without wave function reduction |
title_full | Quantum anti-Zeno effect without wave function reduction |
title_fullStr | Quantum anti-Zeno effect without wave function reduction |
title_full_unstemmed | Quantum anti-Zeno effect without wave function reduction |
title_short | Quantum anti-Zeno effect without wave function reduction |
title_sort | quantum anti-zeno effect without wave function reduction |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3647171/ http://dx.doi.org/10.1038/srep01752 |
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