Satellite-based Free-Space Optical Quantum Key Distribution (QKD) Systems for Secured Wireless Networks

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In the AY2022, we work on the proposal of a novel entanglement-based FSO/QKD system that uses LEO and GEO satellites. FSO/QKD systems using low-Earth orbit (LEO) satellites and EB scheme have been proposed previously. The LEO satellite benefits from the low channel loss; however, its coverage is limited. While a geosynchronous satellite (GEO) satellite with an altitude of 35,786 km can solve the coverage problem, the system suffers from a high path loss and limited key rates. Therefore, combining GEO and LEO satellites becomes a promising solution for the global-scale QKD network. In our proposal, we focus on designing a system that can support multiple wireless users, which opens the potential to establish a global-scale QKD network. Based on the design criteria for the proposed system, we investigate the feasibility of a case study for the Japan QKD network using the existing GEO satellite and LEO satellite constellation to provide QKD service for legitimate users in Japan. Furthermore, the secret key performance of the proposed system is studied based on the design criteria of transmitters and receivers considering the unauthorize receiver attack (URA) and beam-splitting attack (BSA). In particular, we aim to design the transmitted signal to prevent URA and propose a simple scheme that allows legitimate users to detect BSA. Besides, we work on issues related to the design and applications of satellite based FSO systems, including hybrid FSO/RF systems, error control and improvement using advanced hybrid ARQ technique.