Phys. Rev. A 80, 042304 (2009) [11 pages]Probing the quantumness of channels with mixed statesReceived 9 July 2009; published 6 October 2009 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 and reprepare channels, the benchmarks are found to be very tight in the considered experimental regimes. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.80.042304
DOI:
10.1103/PhysRevA.80.042304
PACS:
03.67.Hk, 03.67.Mn, 42.50.Xa
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