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 |
|---|---|
| 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