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  • Experimental proof of nonlocal wavefunction collapse for a single particle using homodyne measurements

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    Accepted Manuscript (AM)
    Author(s)
    Fuwa, Maria
    Takeda, Shuntaro
    Zwierz, Marcin
    Wiseman, Howard M
    Furusawa, Akira
    Griffith University Author(s)
    Wiseman, Howard M.
    Year published
    2015
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    Abstract
    A single quantum particle can be described by a wavefunction that spreads over arbitrarily large distances; however, it is never detected in two (or more) places. This strange phenomenon is explained in the quantum theory by what Einstein repudiated as ‘spooky action at a distance’: the instantaneous nonlocal collapse of the wavefunction to wherever the particle is detected. Here we demonstrate this single-particle spooky action, with no efficiency loophole, by splitting a single photon between two laboratories and experimentally testing whether the choice of measurement in one laboratory really causes a change in the local ...
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    A single quantum particle can be described by a wavefunction that spreads over arbitrarily large distances; however, it is never detected in two (or more) places. This strange phenomenon is explained in the quantum theory by what Einstein repudiated as ‘spooky action at a distance’: the instantaneous nonlocal collapse of the wavefunction to wherever the particle is detected. Here we demonstrate this single-particle spooky action, with no efficiency loophole, by splitting a single photon between two laboratories and experimentally testing whether the choice of measurement in one laboratory really causes a change in the local quantum state in the other laboratory. To this end, we use homodyne measurements with six different measurement settings and quantitatively verify Einstein’s spooky action by violating an Einstein–Podolsky–Rosen-steering inequality by 0.042±0.006. Our experiment also verifies the entanglement of the split single photon even when one side is untrusted.
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    Journal Title
    Nature Communications
    Volume
    6
    DOI
    https://doi.org/10.1038/ncomms7665
    Copyright Statement
    © 2015 Nature Publishing Group. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal website for access to the definitive, published version.
    Subject
    Particle physics
    Publication URI
    http://hdl.handle.net/10072/102446
    Collection
    • Journal articles

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