期刊
OPTICS EXPRESS
卷 17, 期 25, 页码 23153-23159出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.17.023153
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资金
- Austrian Science Foundation FWF [TRP-L135, SFB-1520]
We demonstrate a compact and stable source of polarization-entangled pairs of photons, one at 810 nm wavelength for high detection efficiency and the other at 1550 nm for long-distance fiber communication networks. Due to a novel Sagnac-based design of the interferometer no active stabilization is needed. Using only one 30 mm ppKTP bulk crystal the source produces photons with a spectral brightness of 1.13 x 10(6) pairs/s/mW/THz with an entanglement fidelity of 98.2%. Both photons are single-mode fiber coupled and ready to be used in quantum key distribution (QKD) or transmission of photonic quantum states over large distances. (C) 2009 Optical Society of America
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