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APS » Journals » Phys. Rev. A » Volume 81 » Issue 6
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Phys. Rev. A 81, 060306(R) (2010) [4 pages]

Quantum benchmarks for the storage or transmission of quantum light from minimal resources

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Hauke Häseler and Norbert Lütkenhaus
Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, ON, N2L 3G1, Canada and Quantum Information Theory Group, Institut für Theoretische Physik I, and Max Planck Institute for the Science of Light, University of Erlangen-Nürnberg, 91058 Erlangen, Germany

Received 14 November 2009; revised 12 March 2010; published 25 June 2010

We investigate several recently published benchmark criteria for storage or transmission of continuous-variable quantum information. A comparison reveals that criteria based on a Gaussian distribution of coherent states are most resilient to noise. We then address the issue of experimental resources and derive an equally strong benchmark, solely based on three coherent states and homodyne detection. This benchmark is further simplified in the presence of naturally occurring random phases, which remove the need for active input-state modulation.

© 2010 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.81.060306
DOI:
10.1103/PhysRevA.81.060306
PACS:
03.67.Hk, 42.50.Ex, 42.50.Xa
 
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