"Free-space quantum communication device using atomic filters" applied by Sun Xianping, Luo Jun and Zhan Mingsheng, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, after six years of review, was recently awarded US patent authorization (patent number: US 8031873).
When it is necessary to realize satellite-earth and satellite-satellite long-distance free-space optical communication (laser communication or quantum communication) during the day, when it is required to measure the optical frequency characteristic signal of the material from a long distance outside during the day, when it is desired to observe from 80 ~ 110 When the potassium atom fluorescence and sodium atom fluorescence in the atmosphere at km, what kind of filtering method can be used to suppress the strong background light and read the weak optical signal? Ultra-narrow linewidth atomic filtering research and optical communication in free space, Experimental demonstrations of remote sensing, lidar, etc. show that atomic filtering, which uses physical characteristics such as atomic absorption, emission, dispersion, and internal energy conversion, is one of the ideal methods. It can effectively perform spectral filtering and greatly improve the optical signal. Detection sensitivity. The atomic filtering method therefore has important application value and prospects.
Relying on the platform of atomic molecular physics, Wuhan Institute of Mathematics and Physics applies atomic filtering methods to free space quantum communication systems on the basis of atomic filtering and its application research. Experimental demonstrations show that in quantum communication devices, using low-loss media introduced by atomic filters and ultra-narrow linewidth spectral filtering devices, the free space quantum key distribution system can work under strong light (Applied Physics Letter , 89 19 (2006), 191121.). The experiment also demonstrates a Raman amplified atomic filtering method (Optics Letters, 33 16 (2008), 1842.), which can further reduce the communication error rate caused by the background light noise, thereby ensuring a secure quantum key. The atomic filtering method is expected to be applied to the quantum Internet, free space quantum key distribution system, high-precision optical Doppler velocity measurement and optical remote sensing in the background of strong sunlight and very weak signal light, to ensure that these systems are all day and night. Running.
These studies were supported by the National 973 Project (2001CB309309), the Chinese Academy of Sciences Knowledge Innovation Project (KGCX2-SW-103) and the National Natural Science Foundation of China.
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