Entanglement generation and degradation by passive optical devices
Quantum Physics
2009-11-07 v1
Abstract
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.
Cite
@article{arxiv.quant-ph/0103167,
title = {Entanglement generation and degradation by passive optical devices},
author = {Stefan Scheel and Dirk-Gunnar Welsch},
journal= {arXiv preprint arXiv:quant-ph/0103167},
year = {2009}
}
Comments
11 pages, RevTeX, 11 eps figures