Interference of quantum channels

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We show how interferometry can be used to characterize certain aspects of general quantum processes and, in particular, the coherence of completely positive maps. We derive a measure of coherent fidelity, the maximum interference visibility, and the closest unitary operator to a given physical process under this measure.

Original languageEnglish
Article number067902
Number of pages4
JournalPhysical Review Letters
Issue number6
Publication statusPublished - 8 Aug 2003


  • interferometry
  • quantum processes
  • coherent fidelity

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