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Short-wave infrared continuous-variable quantum key distribution over satellite-to-submarine channels
Institution:1.School of Automation, Central South University, Changsha 410083, China;2.College of Computer Science and Electronic Engineering, Hunan University, Changsha 410082, China;3.School of Computer Science, Beijing University of Posts and Telecommunications, Beijing 100876, China
Abstract:The trans-media transmission of quantum pulse is one of means of free-space transmission which can be applied in continuous-variable quantum key distribution (CVQKD) system. In traditional implementations for atmospheric channels, the 1500-to-1600-nm pulse is regarded as an ideal quantum pulse carrier. However, the underwater transmission of this pulses tends to suffer from severe attenuation, which inevitably deteriorates the security of the whole CVQKD system. In this paper, we propose an alternative scheme for implementations of CVQKD over satellite-to-submarine channels. We estimate the parameters of the trans-media channels, involving atmosphere, sea surface and seawater and find that the short-wave infrared performs well in the above channels. The 450-nm pulse is used for generations of quantum signal carriers to accomplish quantum communications through atmosphere, sea surface and seawater channels. Numerical simulations show that the proposed scheme can achieve the transmission distance of 600 km. In addition, we demonstrate that non-Gaussian operations can further lengthen its maximal transmission distance, which contributes to the establishment of practical global quantum networks.
Keywords:continuous-variable quantum key distribution (CVQKD)  short-wave infrared  satellite-to-submarine  
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