Scientific Results

High degree of entanglement and nonlocality of a two-photon state generated at 532 nm

Year: 2011

Authors: Sciarrino F., Vallone G., Milani G., Avella A., Galinis J., Machulka R., Perego A. M., Spasibko K. J., Allevi A., Bondani M., Mataloni P.

Autors Affiliation: Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy; Ist Nazl Ott INO CNR, I-50125 Florence, Italy; Univ Padua, Dipartimento Ingn Informaz, I-35131 Padua, Italy; Univ Turin, Dipartimento Fis Teor, I-10125 Turin, Italy; Vilnius Univ, Dept Quantum Elect, LT-10222 Vilnius, Lithuania; Palacky Univ, Fac Sci, Inst Phys, Acad Sci Czech Republ, Olomouc 77146, Czech Republic; Palacky Univ, Joint Lab Opt, Reg Ctr Adv Technol & Mat, Olomouc 77146, Czech Republic; MV Lomonosov Moscow State Univ, Dept Phys, Moscow 119991, Russia; UdR Como, CNISM, Como, Italy; CNR, Ist Foton & Nanotecnol, I-00185 Rome, Italy; Univ Insubria, Dipartimento Fis & Matemat, Como, Italy

Abstract: In the last years the attention of the scientific community on the generation of entangled states has constantly increased both for their importance in the foundation of quantum mechanics and for their application in the quantum computation and communication field. To these aims high quality of generated states is required. A standard procedure to produce entangled photons pairs is spontaneous down conversion process in nonlinear crystals. In this paper we report preparation of quantum entangled states using CW laser at 266 nm pumping the standard Kwiat\’s source. We have been able to generate the full set of Bell\’s states with very high purity, fidelity and Concurrence which have been estimated using standard tomography procedure. To proof the high degree of achieved entanglement, we performed a non-locality test obtaining a high violation of the CHSH inequality.


Volume: 199 (1)      Pages from: 111  to: 125

More Information: The experiment has been performed in the context of STELLA, the School for Training in Experiments with Lasers and Laser Applications, hold at the Insubria University in Como from June 20 to July 8 2011 (see The Authors wish to acknowledge CARIPLO, UNIVERCOMO and Banca del Monte di Lombardia Foundations for having financed the project. The Authors like also to acknowledge I. Gianani for support in preparing the experimental setup and P. Di Trapani for fund raising and project coordination.
DOI: 10.1140/epjst/e2011-01507-y

Citations: 9
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