Scattering theory of plasmon-assisted entanglement transfer and distillation

Details Scattering theory of plasmon-assisted entanglement transfer and distillation Scattering theory of plasmon-assisted entanglement transfer and distillation

2002-11-18

arxiv.org/abs/quant-ph/0211103v2

Phys. Rev. A 68, 043807 (2003)

Physics

Quantum Physics

4 pages including 2 figures; two references added, plasmon model included

Scientific paper

10.1103/PhysRevA.68.043807

We analyse the quantum mechanical limits to the plasmon-assisted entanglement transfer observed by E. Altewischer, M.P. van Exter, and J.P. Woerdman [Nature, 418, 304 (2002)]. The maximal violation S of Bell's inequality at the photodetectors behind two linear media (such as the perforated metal films in the experiment) can be described by two ratio's tau_1, tau_2 of polarization-dependent transmission probabilities. A fully entangled incident state is transferred without degradation for tau_1=tau_2, but a relatively large mismatch of tau_1 and tau_2 can be tolerated with a small reduction of S. We predict that fully entangled Bell pairs can be distilled out of partially entangled radiation if tau_1 and tau_2 satisfy a pair of inequalities.

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