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Quantum nature of laser light

Jeffers, J. and Pegg, D.T. (2005) Quantum nature of laser light. Journal of Modern Optics, 52 (13). pp. 1835-1856. ISSN 0950-0340

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    Abstract

    All compositions of a mixed-state density operator are equivalent for the prediction of the probabilities of future outcomes of measurements. For retrodiction, however, this is not the case. The retrodictive formalism of quantum mechanics provides a criterion for deciding that some compositions are fictional. Fictional compositions do not contain preparation device operators, that is operators corresponding to states that could have been prepared. We apply this to Mølmer's controversial conjecture that optical coherences in laser light are a fiction and find agreement with his conjecture. We generalize Mølmer's derivation of the interference between two lasers to avoid the use of any fictional states. We also examine another possible method for discriminating between coherent states and photon number states in laser light and find that it does not work, with the equivalence for prediction saved by entanglement.

    Item type: Article
    ID code: 6167
    Keywords: quantum, laser, light, optics, quantum physics, laser light, quantum mechanics, photon, Optics. Light, Atomic and Molecular Physics, and Optics
    Subjects: Science > Physics > Optics. Light
    Department: Faculty of Science > Physics
    Related URLs:
    Depositing user: Miss Darcy Spiller
    Date Deposited: 21 May 2008
    Last modified: 05 Sep 2014 13:37
    URI: http://strathprints.strath.ac.uk/id/eprint/6167

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