Probing the quantumness of channels with mixed states

Details Probing the quantumness of channels with mixed states Probing the quantumness of channels with mixed states

2009-07-03

arxiv.org/abs/0907.0699v2

Physical Review A {\bf 80}, 042304 (2009)

Physics

Quantum Physics

11 Pages, 9 Figures, published version

Scientific paper

10.1103/PhysRevA.80.042304

We present an alternative approach to the derivation of benchmarks for quantum channels, such as memory or teleportation channels. Using the concept of effective entanglement and the verification thereof, a testing procedure is derived which demands very few experimental resources. The procedure is generalized by allowing for mixed test states. By constructing optimized measure & re-prepare channels, the benchmarks are found to be very tight in the considered experimental regimes.

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