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  • Complementarity relations for quantum coherence

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    ChengPUB994.pdf (435.7Kb)
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    Accepted Manuscript (AM)
    Author(s)
    Cheng, Shuming
    Hall, Michael
    Griffith University Author(s)
    Hall, Michael J.
    Cheng, Shuming
    Year published
    2015
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    Abstract
    Various measures have been suggested recently for quantifying the coherence of a quantum state with respect to a given basis. We first use two of these, the l 1 -norm and relative entropy measures, to investigate tradeoffs between the coherences of mutually unbiased bases. Results include relations between coherence, uncertainty, and purity; tight general bounds restricting the coherences of mutually unbiased bases; and an exact complementarity relation for qubit coherences. We further define the average coherence of a quantum state. For the l 1 -norm measure this is related to a natural “coherence radius” for the state ...
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    Various measures have been suggested recently for quantifying the coherence of a quantum state with respect to a given basis. We first use two of these, the l 1 -norm and relative entropy measures, to investigate tradeoffs between the coherences of mutually unbiased bases. Results include relations between coherence, uncertainty, and purity; tight general bounds restricting the coherences of mutually unbiased bases; and an exact complementarity relation for qubit coherences. We further define the average coherence of a quantum state. For the l 1 -norm measure this is related to a natural “coherence radius” for the state and leads to a conjecture for an l 2 -norm measure of coherence. For relative entropy the average coherence is determined by the difference between the von Neumann entropy and the quantum subentropy of the state and leads to upper bounds for the latter quantity. Finally, we point out that the relative entropy of coherence is a special case of G-asymmetry, which immediately yields several operational interpretations in contexts as diverse as frame alignment, quantum communication, and metrology, and suggests generalizing the property of quantum coherence to arbitrary groups of physical transformations.
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    Journal Title
    Physical Review A
    Volume
    92
    Issue
    4
    DOI
    https://doi.org/10.1103/PhysRevA.92.042101
    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
    Quantum information, computation and communication
    Quantum physics not elsewhere classified
    Chemical sciences
    Publication URI
    http://hdl.handle.net/10072/102007
    Collection
    • Journal articles

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