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. Cialdi
Primo
;
F. Castelli
Secondo
;
M. Paris
Ultimo
2009-02-10

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.
Down-conversion ; entanglement ; coherence time ; quantum tomography
Settore FIS/03 - Fisica della Materia
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/66800
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