Measuring two-photon orbital angular momentum entanglement
Fernández Calvo, Gabriel (Universitat Autònoma de Barcelona. Departament de Física)
Picón Álvarez, Antonio (Universitat Autònoma de Barcelona. Departament de Física)
Bramon Planas, Albert (Universitat Autònoma de Barcelona. Departament de Física)
American Physical Society

Date:	2007
Abstract:	We put forward an approach to estimate the amount of bipartite spatial entanglement of down-converted photon states correlated in orbital angular momentum and the magnitude of the transverse (radial) wave vectors. Both degrees of freedom are properly considered in our framework, which only requires azimuthal local linear optical transformations and mode selection analysis with two fiber detectors. The coincidence distributions predicted by our approach give an excellent fit to the distributions measured in a recent experiment aimed to show the very high-dimensional transverse entanglement of twin photons from a down-conversion source. Our estimate for the Schmidt number is substantially lower but still confirms the presence of high-dimensional entanglement.
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Published in:	Physical review. A, Vol. 75, Issue 1 (January 2007) , p. 012319-1-012319-8, ISSN 1050-2947

DOI: 10.1103/PhysRevA.75.012319

8 p, 313.2 KB

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