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  • Excited-to-excited-state scattering using weak measurements

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    UndurtiPUB757.pdf (468.9Kb)
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    Accepted Manuscript (AM)
    Author(s)
    Sainadh, Satya U
    Narayanan, Andal
    Griffith University Author(s)
    Undurti, Satya Sainadh S.
    Year published
    2015
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    Abstract
    Weak measurements are a subset of measurement processes in quantum mechanics wherein the system, which is being measured, interacts very weakly with the measuring apparatus. Measurement values of observables undergoing a weak interaction and their amplification are concepts that have sharpened our understanding of interaction processes in quantum mechanics. Recent experiments show that naturally occurring processes such as resonance fluorescence from excited states of an atom can exhibit weak value amplification effect. In this paper we theoretically analyze the process of elastic resonance fluorescence from a V -type ...
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    Weak measurements are a subset of measurement processes in quantum mechanics wherein the system, which is being measured, interacts very weakly with the measuring apparatus. Measurement values of observables undergoing a weak interaction and their amplification are concepts that have sharpened our understanding of interaction processes in quantum mechanics. Recent experiments show that naturally occurring processes such as resonance fluorescence from excited states of an atom can exhibit weak value amplification effect. In this paper we theoretically analyze the process of elastic resonance fluorescence from a V -type three-level atomic system, using the well-known Weiskopff-Wigner (WW) theory of spontaneous emission. Within this theory we show that a weak interaction regime can be identified and for suitable choices of initial and final excited states the mean scattering time between these states show an amplification effect during interaction with the vacuum bath modes of the electromagnetic field. We thus show that a system-bath interaction can show weak value amplification. Using our theory we reproduce the published experimental results carried out in such a system. More importantly, our theory can calculate scattering time scales in elastic resonance scattering between multiple excited states of a single atom or between common excited state configurations of interacting multiatom systems.
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    Journal Title
    Physical Review A - Atomic, Molecular, and Optical Physics
    Volume
    92
    Issue
    5
    DOI
    https://doi.org/10.1103/PhysRevA.92.052123
    Copyright Statement
    © 2015 American Physical Society. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
    Subject
    Mathematical sciences
    Physical sciences
    Other physical sciences not elsewhere classified
    Chemical sciences
    Publication URI
    http://hdl.handle.net/10072/101729
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    • Journal articles

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