Fidelity and coherence measures from interference

D.K.L. Oi, J. Aberg

Research output: Contribution to journalArticle

12 Citations (Scopus)

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.

LanguageEnglish
Article number220404
Number of pages4
JournalPhysical Review Letters
Volume97
DOIs
Publication statusPublished - 2006

Fingerprint

interference
interferometers
preparation
visibility
interferometry
degrees of freedom
tomography
probes
polarization

Keywords

  • interferometry
  • fidelity
  • interference
  • coherence measures

Cite this

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Fidelity and coherence measures from interference. / Oi, D.K.L.; Aberg, J.

In: Physical Review Letters, Vol. 97, 220404, 2006.

Research output: Contribution to journalArticle

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AB - 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.

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