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Phys. Rev. A 71, 062322 (2005) [7 pages]

Entangled states of light and their robustness against photon absorption

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S. J. van Enk1,2 and O. Hirota3
1Bell Labs, Lucent Technologies, 600-700 Mountain Avenue, Murray Hill, New Jersey 07974, USA
2Institute for Quantum Information, California Institute of Technology, Pasadena, California 91125, USA
3Research Center for Quantum Communications, Tamagawa University, Tokyo, Japan

Received 31 December 2004; published 17 June 2005

We study how photon absorption losses degrade the bipartite entanglement of entangled states of light. We consider two questions: (i) What state contains the smallest average number of photons given a fixed amount of entanglement? (ii) What state is the most robust against photon absorption? We explain why the two-mode squeezed state is the answer to the first question but not quite to the second question.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.71.062322
DOI:
10.1103/PhysRevA.71.062322
PACS:
03.67.Mn, 42.50.Dv, 03.67.Hk
 
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