The generation of entangled photon pairs by parametric down-conversion from solid state CW lasers with small coherence time is theoretically and experimentally analyzed. We consider a compact and low-cost setup based on a two-crystal scheme with Type-I phase matching. We study the effect of the pump coherence time over the entangled state visibility and over the violation of Bell's inequality, as a function of the crystal length. The full density matrix is reconstructed by quantum tomography. The proposed theoretical model is verified using a purification protocol based on a compensation crystal.
Properties of entangled photon pairs generated by a CW laser with small coherence time : theory and experiment / S. Cialdi, F. Castelli, M. Paris. - In: JOURNAL OF MODERN OPTICS. - ISSN 0950-0340. - 56:2-3(2009 Feb 10), pp. 215-225. [10.1080/09500340802187332]
Properties of entangled photon pairs generated by a CW laser with small coherence time : theory and experiment
S. CialdiPrimo
;F. CastelliSecondo
;M. ParisUltimo
2009
Abstract
The generation of entangled photon pairs by parametric down-conversion from solid state CW lasers with small coherence time is theoretically and experimentally analyzed. We consider a compact and low-cost setup based on a two-crystal scheme with Type-I phase matching. We study the effect of the pump coherence time over the entangled state visibility and over the violation of Bell's inequality, as a function of the crystal length. The full density matrix is reconstructed by quantum tomography. The proposed theoretical model is verified using a purification protocol based on a compensation crystal.Pubblicazioni consigliate
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