Entanglement generation and degradation by passive optical devices

Details Entanglement generation and degradation by passive optical devices Entanglement generation and degradation by passive optical devices

2001-03-30

arxiv.org/abs/quant-ph/0103167v1

Physics

Quantum Physics

11 pages, RevTeX, 11 eps figures

Scientific paper

10.1103/PhysRevA.64.063811

The influence of losses in the interferometric generation and the transmission of continuous-variable entangled light is studied, with special emphasis on Gaussian states. Based on the theory of quantum-state transformation at absorbing dielectric devices, the amount of entanglement is quantified by means of the relative-entropy measure. Upper bounds of entanglement and the distance to the set of separable Gaussian states are calculated. Compared with the distance measure, the bounds can substantially overestimate the entanglement. In particular, they do not show the drastic decrease of entanglement with increasing mean photon number, as does the distance measure.

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