Optimal purifications and fidelity for displaced thermal states

Details Optimal purifications and fidelity for displaced thermal states Optimal purifications and fidelity for displaced thermal states

2007-06-21

arxiv.org/abs/0706.3204v2

Physical Review A 76, 054307 (2007)

Physics

Quantum Physics

published version

Scientific paper

10.1103/PhysRevA.76.054307

We evaluate the Uhlmann fidelity between two one-mode displaced thermal
states as the maximal probability transition between appropriate purifications
of the given states. The optimal purifications defining the fidelity are proved
to be two-mode displaced Gaussian states.

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