Simulation study on fluctuation characteristics of channel transmittance for free-space continuous-variable quantum key distribution quantum

Zhigeng WU; Ming LI; Zhenghao YAO; Tianyi WANG

doi:10.3788/IRLA20240210

Journals >Infrared and Laser Engineering >Volume 53 >Issue 8 >Page 20240210 > Article

Infrared and Laser Engineering
Vol. 53, Issue 8, 20240210 (2024)

Simulation study on fluctuation characteristics of channel transmittance for free-space continuous-variable quantum key distribution quantum

Zhigeng WU^1,2, Ming LI^1,2, Zhenghao YAO^1,2, and Tianyi WANG³

Author Affiliations

¹College of Electronic and Communication Engineering, Tianjin Normal University, Tianjin 300387, China

²Tianjin Key Laboratory of Wireless Mobile Communications and Power Transmission, Tianjin Normal University, Tianjin 300387, China

³College of Big Data and Information Engineering, Guizhou University, Guiyang 550025, China

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DOI: 10.3788/IRLA20240210 Cite this Article

Zhigeng WU, Ming LI, Zhenghao YAO, Tianyi WANG. Simulation study on fluctuation characteristics of channel transmittance for free-space continuous-variable quantum key distribution quantum[J]. Infrared and Laser Engineering, 2024, 53(8): 20240210 Copy Citation Text

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$Sketch of free space continuous-variable quantum key distribution[24] (AWG is the Arbitrary Waveform Generation, and the splitter holds the same transmittance \begin{document}$ \eta $\end{document} as that of free space quantum channel)$

Fig. 1. Sketch of free space continuous-variable quantum key distribution^[24] (AWG is the Arbitrary Waveform Generation, and the splitter holds the same transmittance

Unknown environment 'document'

as that of free space quantum channel)

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Fig. 2. Comparison of the Kolmogorov spectrum model (K_Model) and the modified Von Karman spectrum model (MVK_Model)

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Fig. 3. Numerical simulations of free space quantum channel with split-step transmission combined with phase screen flat panel method

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Fig. 4. Numerical simulation results associated with transmittances of free space quantum channels based on the Kolmogorov spectrum model (K_Model) and the modified Von Karman spectrum model (MVK_Model) under various atmospheric turbulence conditions

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Fig. 5. Comparison of the statistical probability density of free space quantum channel transmittance based on the numerical simulation results and the existing analytical models under (a) weak turbulence and (b) moderate turbulence

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Parameter	Weak	Moderate
Structure constant $ {C}_{n}^{2}/{\mathrm{m} }^{-2/3} $	$ 5\times {10}^{-15} $	$ 1.5\times {10}^{-14} $
Outer scale $ {L}_{0}/\mathrm{m} $	80	80
Inner scale $ {l}_{0}/\mathrm{m} $	$ {10}^{-3} $	$ {10}^{-3} $
Beam-spot radius at the transmitter $ {W}_{0}/\mathrm{c}\mathrm{m} $	2	2
wavelength $ {\lambda }_{\mathrm{b}\mathrm{e}\mathrm{a}\mathrm{m}}/\mathrm{n}\mathrm{m} $	809	809
Distance $ L/\mathrm{m} $	2000	2000
Rytov variance $ {R}_{v} $	0.75	2.27

Table 1. Parameters during free space quantum channel simulations

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