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Opt Express. 2013 May 20;21(10):11943-51. doi: 10.1364/OE.21.011943.

Phase-stable source of polarization-entangled photons in a linear double-pass configuration.

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ICFO-Institut de Ciencies Fotoniques, 08860 Castelldefels, Barcelona, Spain.


We demonstrate a compact, robust, and highly efficient source of polarization-entangled photons, based on linear bi-directional down-conversion in a novel 'folded sandwich' configuration. Bi-directionally pumping a single periodically poled KTiOPO(4) (ppKTP) crystal with a 405-nm laser diode, we generate entangled photon pairs at the non-degenerate wavelengths 784 nm (signal) and 839 nm (idler), and achieve an unprecedented detection rate of 11.8 kcps for 10.4 μW of pump power (1.1 million pairs / mW), in a 2.9-nm bandwidth, while maintaining a very high two-photon entanglement quality, with a Bell-state fidelity of 99.3 ± 0.3%.

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