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  • Criteria for generalized macroscopic and mesoscopic quantum coherence

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    Author(s)
    Cavalcanti, EG
    Reid, MD
    Griffith University Author(s)
    Cavalcanti, Eric G.
    Year published
    2008
    Metadata
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    Abstract
    We consider macroscopic, mesoscopic, and "S-scopic" quantum superpositions of eigenstates of an observable and develop some signatures for their existence. We define the extent, or size S of a superposition, with respect to an observable x謠as being the range of outcomes of x蠰redicted by that superposition. Such superpositions are referred to as generalized S-scopic superpositions to distinguish them from the extreme superpositions that superpose only the two states that have a difference S in their prediction for the observable. We also consider generalized S-scopic superpositions of coherent states. We explore the ...
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    We consider macroscopic, mesoscopic, and "S-scopic" quantum superpositions of eigenstates of an observable and develop some signatures for their existence. We define the extent, or size S of a superposition, with respect to an observable x謠as being the range of outcomes of x蠰redicted by that superposition. Such superpositions are referred to as generalized S-scopic superpositions to distinguish them from the extreme superpositions that superpose only the two states that have a difference S in their prediction for the observable. We also consider generalized S-scopic superpositions of coherent states. We explore the constraints that are placed on the statistics if we suppose a system to be described by mixtures of superpositions that are restricted in size. In this way we arrive at experimental criteria that are sufficient to deduce the existence of a generalized S-scopic superposition. The signatures developed are useful where one is able to demonstrate a degree of squeezing. We also discuss how the signatures enable a new type of Einstein-Podolsky-Rosen gedanken experiment.
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    Journal Title
    Physical Review A (Atomic, Molecular and Optical Physics)
    Volume
    77
    Issue
    6
    Publisher URI
    http://pra.aps.org/
    DOI
    https://doi.org/10.1103/PhysRevA.77.062108
    Copyright Statement
    © 2008 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 link for access to the definitive, published version.
    Subject
    Mathematical sciences
    Physical sciences
    Foundations of quantum mechanics
    Publication URI
    http://hdl.handle.net/10072/22544
    Collection
    • Journal articles

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