Probing the quantumness of channels with mixed states

Hauke Häseler and Norbert Lütkenhaus
Phys. Rev. A 80, 042304 – Published 6 October 2009

Abstract

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.

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  • Received 9 July 2009

DOI:https://doi.org/10.1103/PhysRevA.80.042304

©2009 American Physical Society

Authors & Affiliations

Hauke Häseler and Norbert Lütkenhaus

  • Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, Canada and Quantum Information Theory Group, University of Erlangen, Germany

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Issue

Vol. 80, Iss. 4 — October 2009

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