Collinear source of polarization-entangled photon pairs at non-degenerate wavelengths

Details Collinear source of polarization-entangled photon pairs at non-degenerate wavelengths Collinear source of polarization-entangled photon pairs at non-degenerate wavelengths

2008-04-23

arxiv.org/abs/0804.3799v1

Physics

Quantum Physics

4 pages, 4 figures, accepted in Applied Physics Letters

Scientific paper

10.1063/1.2924280

We report on a simple but highly efficient source of polarization-entangled photon pairs at non-degenerate wavelengths. The fully collinear configuration of the source enables very high coupling efficiency into a single optical mode and allows the use of long nonlinear crystals. With optimized dispersion compensation it is possible to use a free-running laser diode as pump source and to reach an entanglement fidelity of 99.4 % at rates as high as 27000 pairs/s per mW of pump power. This greatly enhances the practicality of the source for applications in quantum communication and metrology.

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