FPGA Based Digital Phase-Coding Quantum Key Distribution System
Science China Physics, Mechanics & Astronomy/Science China Physics, mechanics & astronomy(2015)
Abstract
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.
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Key words
quantum key distribution,phase-coding,digital phase modulation,field programmable gate array,Faraday-Michelson interferometer
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