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Disentanglement in bipartite continuous-variable systems

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Cassemiro,  K. N.
Silberhorn Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;

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Villar,  A. S.
4pi Photon Atom Coupling, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Barbosa, F. A. S., de Faria, A. J., Coelho, A. S., Cassemiro, K. N., Villar, A. S., Nussenzveig, P., et al. (2011). Disentanglement in bipartite continuous-variable systems. PHYSICAL REVIEW A, 84(5): 052330. doi:10.1103/PhysRevA.84.052330.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-6969-F
Abstract
Entanglement in bipartite continuous-variable systems is investigated in the presence of partial losses such as those introduced by a realistic quantum communication channel, e. g., by propagation in an optical fiber. We find that entanglement can vanish completely for partial losses, in a situation reminiscent of so-called entanglement sudden death. Even states with extreme squeezing may become separable after propagation in lossy channels. Having in mind the potential applications of such entangled light beams to optical communications, we investigate the conditions under which entanglement can survive for all partial losses. Different loss scenarios are examined, and we derive criteria to test the robustness of entangled states. These criteria are necessary and sufficient for Gaussian states. Our study provides a framework to investigate the robustness of continuous-variable entanglement in more complex multipartite systems.