Researching | Quantum Key Distribution System Based on Polarization Filtering for Background Light Suppression

Acta Optica Sinica, Volume. 38, Issue 12, 1227001(2018)

Quantum Key Distribution System Based on Polarization Filtering for Background Light Suppression

Qiuli Zhu^**, Lei Shi^*, Jiahua Wei, Yu Zhu, Ru Yang, Kaihang Zhou, and Guhao Zhao

Author Affiliations

Information and Navigation College, Air Force Engineering University, Xi'an, Shaanxi 710077, China

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Fig. 1. Polarized light S3 synthesized by signal lights S1 and S2

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Fig. 2. Implementation of BB84 protocol with discrete phase coding

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Fig. 3. Discrete phase coded free space QKD system based on polarization filtering

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Fig. 4. Time demodulation of signal lights S1 and S2

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Fig. 5. Schematic of signal light transmission and deflection angle of polarization filtering

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Fig. 6. Simulation of polarization degree of atmospheric background light

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Fig. 7. Background light suppression ratio when P=0

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Fig. 8. Background light suppression ratio when P=0.2

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Fig. 9. Background light suppression ratio when P=0.6

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Fig. 10. Eback versus background light suppression ratio Rratio

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Fig. 11. Ephase versus phase error ?error

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Fig. 12. Polarization error Epolar introduced by interferometer

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Table 1. Simulation parameters for discrete phase coded free space QKD system
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Table 1. Simulation parameters for discrete phase coded free space QKD system
Parameter W /(10⁷·W·m^-3·sr^-1) Δλ /nm $\begin{matrix} {θ_{r}}_{} \end{matrix}$ /μrad d /m t₁(t₂) /s $\begin{matrix} {T_{a}}_{} \end{matrix}$ /% $\begin{matrix} {T_{s}}_{} \end{matrix}$ /% $\begin{matrix} {P_{c}}_{} \end{matrix}$ /% μ
Value 4 1 6 0.5 1 70 80 1 1

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Qiuli Zhu, Lei Shi, Jiahua Wei, Yu Zhu, Ru Yang, Kaihang Zhou, Guhao Zhao. Quantum Key Distribution System Based on Polarization Filtering for Background Light Suppression[J]. Acta Optica Sinica, 2018, 38(12): 1227001

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Paper Information

Category: Quantum Optics

Received: May. 24, 2018

Accepted: Jul. 31, 2018

Published Online: May. 10, 2019

The Author Email:

DOI:10.3788/AOS201838.1227001

Topics

laser devices and laser physics

Lasers and Laser Optics

laser manufacturing

Instrumentation, Measurement and Metrology