Fidelity and coherence measures from interference

Oi, Daniel K. L. and Åberg, Johan (2006) Fidelity and coherence measures from interference. Physical Review Letters, 97. 220404. ISSN 1079-7114 (https://doi.org/10.1103/PhysRevLett.97.220404)

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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
    Dates:
    Date
    Event
    29 November 2006
    Published
    27 March 2006
    Accepted
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Strathprints Administrator
    Date deposited:15 Nov 2011 15:09
    Last modified:08 Apr 2024 16:44
    URI:https://strathprints.strath.ac.uk/id/eprint/9946
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