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

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

2007-02-09

arxiv.org/abs/quant-ph/0702090v1

Optics Express Vol.15, No.16, 10182-10188 (2007)

Physics

Quantum Physics

submitted for publication

Scientific paper

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.

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