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FPGA based digital phase-coding quantum key distribution system
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DOI：10.1007/s11433-015-5742-z.png)
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Abstract
En 中文
Quantum key distribution (QKD) is a technology with the potential capability to achieve information-theoretic security. Phase-coding is an important approach to develop practical QKD systems in fiber channel. In order to improve the phase-coding modulation rate, we proposed a new digital-modulation method in this paper and constructed a compact and robust prototype of QKD system using currently available components in our lab to demonstrate the effectiveness of the method. The system was deployed in laboratory environment over a 50 km fiber and continuously operated during 87 h without manual interaction. The quantum bit error rate (QBER) of the system was stable with an average value of 3.22% and the secure key generation rate is 8.91 kbps. Although the modulation rate of the photon in the demo system was only 200 MHz, which was limited by the Faraday-Michelson interferometer (FMI) structure, the proposed method and the field programmable gate array (FPGA) based electronics scheme have a great potential for high speed QKD systems with Giga-bits/second modulation rate.
Keywords:
quantum key distribution
phase-coding
digital phase modulation
field programmable gate array
Faraday-Michelson interferometer
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