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    Quantum enhanced estimation of diffusion

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    PhysRevA.100.022129.pdf
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    Final Published Version
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    Author
    Branford, Dominic
    Gagatsos, Christos N.
    Grover, Jai
    Hickey, Alexander J.
    Datta, Animesh
    Affiliation
    Univ Arizona, Coll Opt Sci
    Issue Date
    2019-08-30
    
    Metadata
    Show full item record
    Publisher
    PHYSICAL REVIEW A
    Citation
    Branford, D., Gagatsos, C., Grover, J., Hickey, A., & Datta, A. (2019). Quantum enhanced estimation of diffusion. 100(2), Phys. Rev. A 100, 022129 (2019).
    Journal
    AMER PHYSICAL SOC
    Rights
    Copyright © 2019 American Physical Society.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    Momentum diffusion is a possible mechanism for driving macroscopic quantum systems towards classical behaviour. Experimental tests of this hypothesis rely on a precise estimation of the strength of this diffusion. We show that quantum-mechanical squeezing can offer significant improvements, which can be attained by general homodyne measurements including position measurement. With 10 dB of squeezing, experiments would require a tenth of proposed free-fall times. Quantum measurements---beyond study of position---could also allow for a more precise estimation. Our results suggest the potential for quantum enhanced estimation of heating and diffusive dynamics more generally.
    ISSN
    2469-9926
    DOI
    10.1103/physreva.100.022129
    Version
    Final published version
    Sponsors
    European Space Agency's Ariadna scheme [17-1201a]; U.K. EPSRC [EP/K04057X/2]; U.K. National Quantum Technologies Programme [EP/M01326X/1, EP/M013243/1]; COST Action QTSpace [CA15220]
    ae974a485f413a2113503eed53cd6c53
    10.1103/physreva.100.022129
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