Study on improving system performance of differential-phase-shift quantum key distribution

2014 Fiscal Year Final Research Report

• Project/Area Number: 24560045
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Applied optics/Quantum optical engineering
• Research Institution: Osaka University
• Principal Investigator: INOUE Kyo 大阪大学, 工学(系)研究科(研究院), 教授 (10393787)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 量子暗号通信

Outline of Final Research Achievements

We have studied differential-phase-shift (DPS) quantum-key-distribution (QKD) related technologies. (1) “Intensity-modulated DPS-QKD” and “Measurement-device-independent DPS-QKD” have been proposed, which are modified to improve the system performance. (2) The DPS-QKD system performance considering phase fluctuation, that considering bit-error-rate fluctuation, and the robustness of DPS-QKD systems with power monitoring against blind attacks have been clarified, assuming practical situations. (3) “Intensity-modulation/direct-detection QKD” was proposed and evaluated, which features practicality employing apparatus used in conventional optical communication systems. (4) QKD systems multiplexing a quantum channel and a classical channel over one transmission fiber have been investigated, which is desirable in system implementation, where time-division-multiplexing and wavelength-division-multiplexing are assumed.

Free Research Field

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