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Phys. Rev. A 70, 062305 (2004) [5 pages]

Resilience of multiphoton entanglement under losses

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Gabriel A. Durkin1,2,*, Christoph Simon1,2,3, Jens Eisert4, and Dirk Bouwmeester2
1Centre for Quantum Computation, University of Oxford, Oxford OX1 3PU, United Kingdom
2Department of Physics, University of California, Santa Barbara, California 93106, USA
3Laboratoire de Spectrométrie Physique, CNRS et Université J. Fourier-Grenoble, BP 87, 38402 St. Martin d’Hères, France
4Institut für Physik, University of Potsdam, D-14469 Potsdam, Germany

Received 9 August 2004; published 3 December 2004

We analyze the resilience under photon loss of the bipartite entanglement present in multiphoton states produced by parametric down-conversion. The quantification of the entanglement is made possible by a symmetry of the states that persists even under polarization-independent losses. We examine the approach of the states to the set of positive partial transpose states as losses increase, and calculate the relative entropy of entanglement. We find that some bipartite distillable entanglement persists for arbitrarily high losses.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.70.062305
DOI:
10.1103/PhysRevA.70.062305
PACS:
03.67.Mn, 42.50.−p, 03.65.Ud

*Electronic address: gabriel.durkin@qubit.org

 
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