Scientific Results

Control of quantum transverse correlations on a four-photon system

Year: 2011

Authors: de Assis P.-L., Carvalho M.A.D., Berruezo L.P., Ferraz J., Santos I.F., Sciarrino F., Pádua S.

Autors Affiliation: Departamento de Física, Universidade Federal de Minas Gerais, Caixa Postal 702, 30123-980, Belo Horizonte, Brazil;
Departamento de Física, ICE, Universidade Federal de Juiz de Fora, Juiz de Fora, CEP 36036-330, Brazil;
Dipartimento di Fisica, Sapienza Universitá di Roma, Roma 00185, Italy;
Istituto Nazionale di Ottica, Largo Fermi 6, I-50125 Firenze, Italy

Abstract: Control of spatial quantum correlations in bi-photons is one of the fundamental principles of Quantum Imaging. Up to now, experiments have been restricted to controlling the state of a single bi-photon, by using linear optical elements. In this work we demonstrate experimental control of quantum correlations in a four-photon state comprised of two pairs of photons. Our scheme is based on a high-efficiency parametric down-conversion source coupled to a double slit by a variable linear optical setup, in order to obtain spatially encoded qubits. Both entangled and separable pairs have been obtained, by altering experimental parameters. We show how the correlations influence both the interference and diffraction on the double slit. (C) 2011 Optical Society of America

Journal/Review: OPTICS EXPRESS

Volume: 19 (4)      Pages from: 3715  to: 3729

More Information: The authors would like to thank CNPq, CAPES and FAPEMIG Brazilian funding agencies, as well as the INCT-IQ (Instituto Nacional de Ciencia e Tecnologia para Informacao Quantica) for the financial support. P.-L. would like to thank Prof. Nivaldo Speziali for providing the double slits used in this work. We acknowledge support from Italian-Brazilian (CNR-CNPq) Contract (Quantum information in a high dimension Hilbert space).
DOI: 10.1364/OE.19.003715

Citations: 8
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