Memory effects in quantum channel discrimination

Details Memory effects in quantum channel discrimination Memory effects in quantum channel discrimination

2008-03-21

arxiv.org/abs/0803.3237v3

Phys. Rev. Lett. 101, 180501 (2008)

Physics

Quantum Physics

4 pages, 2 figures, revtex4

Scientific paper

10.1103/PhysRevLett.101.180501

We consider quantum-memory assisted protocols for discriminating quantum
channels. We show that for optimal discrimination of memory channels, memory
assisted protocols are needed. This leads to a new notion of distance for
channels with memory. For optimal discrimination and estimation of sets of
unitary channels memory-assisted protocols are not required.

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