期刊
OPTICS EXPRESS
卷 27, 期 9, 页码 12231-12240出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.27.012231
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资金
- China Postdoctoral Science Foundation [2016M600481]
- Natural Science Foundation of Shanghai [18ZR1443700]
- National Natural Science Foundation of China [11774198, U1738142, U1738202]
- Youth Innovation Promotion Association CAS [2017500]
The security of decoy-state quantum key distribution (QKD) highly depends on the accurate control of multiple intensity states. Although several theoretical studies on the QKD with loosely controlled source intensities have been proposed, there is still a large gap between the experimental realization and the theoretical analysis. In this paper, we adopt the gain-switching method to generate short optical pulses, and the corresponding intensity stabilities are quantitatively measured. The method via optical injection is proposed to make effective reductions of the intensity fluctuations from 6.47%similar to 1.59% to 1.95%similar to 1.15% at different optical powers. QKD performance adopting the experimental results is also analyzed and discussed. For a typical 40 dB high-attenuation QKD system, the relative increase on the secure key rates reaches 51.89% for the corresponding intensity fluctuations of 1.15% with optical injection and 1.59% without optical injection. The presented intensity-stable optical pulse source can find wide applications in different QKD protocols, such as BB84, DPS, COW, etc. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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