Polarization entanglement with GRaded-INdex lenses
arXiv:0906.2642 · doi:10.1063/1.3257376
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 2-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.
4 pages, 4 figures, version 2
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