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Chin. Phys. B, 2012, Vol. 21(10): 104204    DOI: 10.1088/1674-1056/21/10/104204

Generation of a squeezed state at 1.55 μ with periodically poled LiNbO3

Liu Qin, Feng Jin-Xia, Li Hong, Jiao Yue-Chun, Zhang Kuan-Shou
State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China
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.
Keywords:  squeezed states      telecommunication wavelength of 1.55 μm      optical parametric amplifier  
Received:  18 January 2012      Revised:  20 March 2012      Published:  01 September 2012
PACS:  42.50.Dv (Quantum state engineering and measurements)  
  42.50.Lc (Quantum fluctuations, quantum noise, and quantum jumps)  
  42.65.Yj (Optical parametric oscillators and amplifiers)  
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).
Corresponding Authors:  Feng Jin-Xia     E-mail:

Cite this article: 

Liu Qin, Feng Jin-Xia, Li Hong, Jiao Yue-Chun, Zhang Kuan-Shou Generation of a squeezed state at 1.55 μ with periodically poled LiNbO3 2012 Chin. Phys. B 21 104204

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