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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...

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Autores principales: Ai, Qing, Xu, Dazhi, Yi, Su, Kofman, A. G., Sun, C. P., Nori, Franco
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2013
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.
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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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