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Fidelity and coherence measures from interference

Oi, D.K.L. and Aberg, J. (2006) Fidelity and coherence measures from interference. Physical Review Letters, 97. p. 220404. ISSN 0031-9007

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    Abstract

    By utilizing single particle interferometry, the fidelity or coherence of a pair of quantum states is identified with their capacity for interference. We consider processes acting on the internal degree of freedom (e.g., spin or polarization) of the interfering particle, preparing it in states ρA or ρB in the respective path of the interferometer. The maximal visibility depends on the choice of interferometer, as well as the locality or nonlocality of the preparations, but otherwise depends only on the states ρA and ρB and not the individual preparation processes themselves. This allows us to define interferometric measures which probe locality and correlation properties of spatially or temporally separated processes, and can be used to differentiate between processes that cannot be distinguished by direct process tomography using only the internal state of the particle.

    Item type: Article
    ID code: 9946
    Keywords: interferometry, fidelity , interference, coherence measures , Physics, Physics and Astronomy(all)
    Subjects: Science > Physics
    Department: Faculty of Science > Physics
    Related URLs:
      Depositing user: Strathprints Administrator
      Date Deposited: 15 Nov 2011 15:09
      Last modified: 05 Sep 2014 00:06
      URI: http://strathprints.strath.ac.uk/id/eprint/9946

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