Performance of hybrid entanglement photon pair source for quantum key distribution

Details Performance of hybrid entanglement photon pair source for quantum key distribution Performance of hybrid entanglement photon pair source for quantum key distribution

2010-02-22

arxiv.org/abs/1002.4226v1

Physics

Quantum Physics

11pages, 4 figures

Scientific paper

We report on the experimental demonstration of a source of hybrid entanglement pairs between two different degrees of freedom, a 1550 nm time-bin qubit and an 810 nm polarization qubit. The polarization qubit at 810 nm is transformed by an asymmetric Mach-Zehnder interferometer consisted of a Glan laser prism and a polarization-maintaining fiber. We obtained visibilities of 95.8% and 88% along Z-Z and X-X axes on the Poincare sphere, respectively with a coincidence count rate of more than 800 c/s after entanglement format transformation. These values are well above the threshold of 70.7% needed to violate a Bell inequality and allow distilling a secure key in the quantum key distribution.

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