Abstract We report on the generation of a squeezing vacuum at 1.55 μm using an optical parametric amplifier based on periodically poled LiNbO3. Using three specifically designed narrow linewidth mode cleaners as the spatial mode and noise filter of the laser at 1.55 μm and 775 nm, the squeezed vacuum of up to 3.0 dB below the shot noise level at 1.55 μm is experimentally obtained. This system is compatible with standard telecommunication optical fibers, and will be useful for continuous variable long-distance quantum communication and distributed quantum computing.
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 60878003), the Science Foundation for Excellent Research Team of the National Natural Science Foundation of China (Grant No. 61121064), and the National Basic Research Program of China (Grant No. 2010CB923101).
Liu Qin (刘勤), Feng Jin-Xia (冯晋霞), Li Hong (李宏), Jiao Yue-Chun (焦月春), Zhang Kuan-Shou (张宽收) Generation of a squeezed state at 1.55 μ with periodically poled LiNbO3 2012 Chin. Phys. B 21 104204
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