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Paper detail

Waveguide-based OPO source of entangled photon pairs

In this paper we present a compact source of narrow-band energy-time entangled photon pairs in the telecom regime based on a Ti-indiffused Periodically Poled Lithium Niobate (PPLN) waveguide resonator, i.e. a waveguide with end-face dielectric multi-layer mirrors. This is a monolithic doubly resonant Optical Parametric Oscillator (OPO) far below threshold, which generates photon pairs by Spontaneous Parametric Down Conversion (SPDC) at around 1560nm with a 117MHz (0.91 pm)- bandwidth. A coherence time of 2.7 ns is estimated by a time correlation measurement and a high quality of the entangled states is confirmed by a Bell-type experiment. Since highly coherent energy-time entangled photon pairs in the telecom regime are suitable for long distance transmission and manipulation, this source is well suited to the requirements of quantum communication.

preprint2009arXivOpen access
Enrico PomaricoBruno SanguinettiNicolas GisinRobert ThewHugo ZbindenGerhard SchreiberAbu ThomasWolfgang Sohler
quant-ph
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Enrico PomaricoBruno SanguinettiNicolas GisinRobert ThewHugo ZbindenGerhard SchreiberAbu ThomasWolfgang Sohler

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