2023 Fiscal Year Annual Research Report
Satellite-based Free-Space Optical Quantum Key Distribution (QKD) Systems for Secured Wireless Networks
| Project/Area Number |
21K11870
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| Research Institution | The University of Aizu |
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Principal Investigator |
Anh・T Pham 会津大学, コンピュータ理工学部, 教授 (80404896)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | Free-space optics / Quantum key distribution / Satellite communications / Security attack |
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| Outline of Annual Research Achievements |
In the AY2023, we work on two main issues of the proposal. First, we proposed a novel design framework for a global-scale FSO/QKD network based on a GEO satellite as the secret key source and LEO satellites as relay nodes for multiple wireless users. The non-coherent CV-QKD protocol inspired by the BBM92 protocol for EB scheme was employed. The system performance was analyzed, considering the spreading loss, atmospheric attenuation, and turbulence. Based on the design criteria for the proposed system, we investigated the case study for the Japan QKD network, taking into consideration the two prevalent attacks of URA and BSA. We proposed a multiple-access method to improve the total secret key performance. We also proposed a simple yet effective BSA detection method based on the statistical observation of sift probability by legitimate users.
Secondly, we proposed a novel modulation signaling-based QKD protocol that employs eight phases of the optical carrier, therefore named octa-phase shift keying QKD (8PSK-QKD). The proposed QKD protocol shares two key bits simultaneously and consequently exhibits increased spectral efficiency compared to existing modulation signaling-based QKD protocols. To inspect the potential of the system, the 8PSK-QKD system is compared with the quadrature phase shift keying-based QKD (QPSK-QKD) and subcarrier intensity modulation binary phase shift keying-based QKD (SIM/BPSK-QKD) systems. Results reveal the proposed 8PSK-QKD system outperform the SIM/BPSK-QKD and QPSK-QKD.
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