Abstract
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 language | English |
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Article number | 067902 |
Number of pages | 4 |
Journal | Physical Review Letters |
Volume | 91 |
Issue number | 6 |
DOIs | |
Publication status | Published - 8 Aug 2003 |
Keywords
- interferometry
- quantum processes
- coherent fidelity