Entanglement generation via phase-matched processes: different Bell states within the linewidth

It is shown, theoretically and experimentally, that at any type-II spontaneous parametric down-conversion (SPDC) phase matching, the decoherence-free singlet Bell state is always present within the natural bandwidth and can be filtered out by a proper spectral selection. Instead of the frequency sel...

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Bibliographic Details
Published in:arXiv.org 2007-02
Main Authors: Brida, G, Chekhova, M V, Genovese, M, Krivitsky, L A
Format: Article
Language:English
Subjects:
Entanglement
Phase matching
Quantum theory
Online Access:Get full text
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Summary:It is shown, theoretically and experimentally, that at any type-II spontaneous parametric down-conversion (SPDC) phase matching, the decoherence-free singlet Bell state is always present within the natural bandwidth and can be filtered out by a proper spectral selection. Instead of the frequency selection, one can perform time selection of the two-photon time amplitude at the output of a dispersive fibre. Applications to quantum communication are outlined.
ISSN:2331-8422