Scientific Results

Polarization entanglement with graded-index lenses

Year: 2009

Authors: Vallone G., Donati G., de Martini F., Mataloni P.

Autors Affiliation: Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi, Via Panisperna 89/A, Compendio del Viminale, Roma 00184, Italy; Dipartimento di Fisica, Sapienza Università di Roma, Roma 00185, Italy; Accademia Nazionale dei Lincei, via della Lungara 10, Roma 00165, Italy; CNR РIstituto Nazionale di Ottica Applicata, Largo E. Fermi 6, 50125 Firenze, Italy

Abstract: By using an optical device based on the integration of a graded-index (GRIN) rod lens and a single-mode optical fiber we efficiently collected photon pairs generated by spontaneous parametric down-conversion. We show that this system preserves the polarization entanglement of the two-photon states. Hence this device, characterized by a remarkable easiness of alignment and allowing for high coupling efficiency of single-mode radiation, can be used with photons entangled in various degrees of freedom, such as polarization and spatial momentum and to interconnect different sides of complex optical circuits.


Volume: 95 (18)      Pages from: 181110  to: 181110

More Information: This work was supported by Finanziamento Ateneo 2008 (prot. C26A08RMYF) of Sapienza Universita di Roma. Thanks to L. Businaro and R. Ursin for useful discussions and to M. Figliuzzi and A. Rossi for their support in the preparation of the experiment.
KeyWords: gradient index optics; lenses; quantum entanglement
DOI: 10.1063/1.3257376

Citations: 3
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