Research on Key Rate of Continuous Variable Quantum Key Distribution Under Turbulent Channels

Xuchao Liu; Jiaxu Wen; Shaobo Li; Huagui Li; Shilun Sun

doi:10.3788/CJL220981

Chinese Journal of Lasers, Volume. 50, Issue 14, 1412002(2023)

Research on Key Rate of Continuous Variable Quantum Key Distribution Under Turbulent Channels

Xuchao Liu^1,2、*, Jiaxu Wen^1,2, Shaobo Li^1,2, Huagui Li^1,2, and Shilun Sun^1,2

Author Affiliations

¹54th Research Institute of China Electronics Technology Group Corporation, Shijiazhuang 050081, Hebei, China

²Hebei Key Laboratory of Photonic Information Technology and Application, Shijiazhuang 050081, Hebei, China

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Figures & Tables(7)

Fig. 1. Schematic diagram of CVQKD system model under turbulent channels

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Fig. 2. Relationship between excess noise and time delay of CVQKD system under different transmission distances

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Fig. 3. Probability distribution of system transmittance under different transmission distances

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Fig. 4. Variation of CVQKD system excess noise with transmission distance under different time delays

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Fig. 5. Variation of CVQKD system excess noise with transmission distance under different turbulence intensities

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Fig. 6. Variation of CVQKD system key rates with transmission distance under different turbulence intensities

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Table 1. MATLAB simulation parameters

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Table 1. MATLAB simulation parameters

Parameter	Value
Wavelength $λ$ /nm	1550
Initial radius of Gaussian beam $W_{0}$ /m	0.2
Divergence angle $θ$ /rad	2×10^-5
Receiving antenna radius $a$ /m	0.2
Wind speed $V_{w}$ /（m·s^-1）	2
Time division multiplexing delay $Δ t$ /ns	5，10，15
Diameter of fiber core $d_{c o r}$ /μm	9
Focal length of collecting lens F /mm	220
Turbulence intensity $C_{n}^{2}$ /m^-2/3	1×10^-16，1×10^-15， 1×10^-14
Attenuation coefficient $α$ /m^-3	0.0339
Reconciliation efficiency $β$ /%	94
Gaussian modulation variance V	12
Excess noise $ε_{0}$	0.02
Quantum efficiency $η$ /%	60
Dark current noise $v_{e l}$	0.01

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Xuchao Liu, Jiaxu Wen, Shaobo Li, Huagui Li, Shilun Sun. Research on Key Rate of Continuous Variable Quantum Key Distribution Under Turbulent Channels[J]. Chinese Journal of Lasers, 2023, 50(14): 1412002

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Paper Information

Category: quantum optics

Received: Jun. 20, 2022

Accepted: Sep. 9, 2022

Published Online: Jul. 10, 2023

The Author Email: Liu Xuchao (liuxuchao15@mails.ucas.ac.cn)

DOI:10.3788/CJL220981

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology