期刊
OPTICS LETTERS
卷 47, 期 5, 页码 1287-1290出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.451670
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资金
- National Key Research and Development Program of China [2019YFB1803500]
- National Natural Science Foundation of China [61935011, U2001601]
- Science and Technology Planning Project of Guangdong Province [2020B0303040001]
- Key-Area Research and Development Program of Guangdong Province [2018B010114002]
In this study, an optical injection locking based local oscillator regeneration method is proposed for continuous variable quantum key distribution. By sending a weak polarization multiplexed pilot carrier, the minimum input power and noise level at offset frequencies are improved, and the power and phase of the pilot carrier are recovered through OIL.
We develop an optical injection locking (OIL) based local oscillator (LO) regeneration for continuous variable quantum key distribution (CVQKD) by sending a weak polarization multiplexed pilot carrier from the transmitter. The OIL at the receiver has superior performance in terms of minimum input power and noise level at offset frequencies to the erbium-doped fiber amplifier (EDFA)-based scheme. The weak pilot carrier is recovered both in power and phase via the OIL while incurring little excess noise to the CVQKD system. The phase-locked LO enables heterodyne detection of a Gaussian modulated quantum signal with a simple data-aided phase recovery without pilot tone. The obtained parameters are compatible with a raw key rate of 0.83 Mbit/s in the asymptotic regime over a 22-km fiber transmission. The technique is expected to be used in more phase-sensitive quantum optical applications. (C) 2022 Optica Publishing Group
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