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Acta Optica Sinica, Volume. 44, Issue 16, 1627002(2024)

Space Division Multiplexing Quantum Key Distribution Based on Low Loss Multi-Core Fiber

Liangyuan Zhao1、*, Gonghui Zhang2, Wei Sun2, Dong Xu1, Zheng Wei1, Hongyuan Liang1, and Lin Wang2
Author Affiliations
  • 1Jiangsu Hengtong Qasky Quantum Information Research Institute Co., Ltd., Suzhou 215200, Jiangsu , China
  • 2Jiangsu Alpha Optic-Electric Technology Co., Ltd., Suzhou 215200, Jiangsu , China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (13)
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    References (21)
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    Figures & Tables(13)
    Schematic diagram of the space division multiplexing copropagation structure of the QKD and classical communication system based on multi-core optical fiber

    Fig. 1. Schematic diagram of the space division multiplexing copropagation structure of the QKD and classical communication system based on multi-core optical fiber

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    Inter-core crosstalk of classical optical signal

    Fig. 2. Inter-core crosstalk of classical optical signal

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    Inter-core crosstalk of SpRS

    Fig. 3. Inter-core crosstalk of SpRS

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    Structure of the SDM-QKD system based on 4-core multi-core optical fiber

    Fig. 4. Structure of the SDM-QKD system based on 4-core multi-core optical fiber

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    Cross section structure diagram of the 4-core weakly coupled multi-core optical fiber

    Fig. 5. Cross section structure diagram of the 4-core weakly coupled multi-core optical fiber

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    Relationships between detection rates of the crosstalk noises generated by classical signal/SpRS and transmission distance. (a) Detection rate of inter-core crosstalk noise generated by classical signal; (b) detection rate of inter-core crosstalk noise generated by SpRS

    Fig. 6. Relationships between detection rates of the crosstalk noises generated by classical signal/SpRS and transmission distance. (a) Detection rate of inter-core crosstalk noise generated by classical signal; (b) detection rate of inter-core crosstalk noise generated by SpRS

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    Relationships between detection rate of inter-core crosstalk noise generated by 1550.12 nm and 1551.72 nm classical signals and transmission distance, respectively

    Fig. 7. Relationships between detection rate of inter-core crosstalk noise generated by 1550.12 nm and 1551.72 nm classical signals and transmission distance, respectively

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    Relationships between the secret key rate and transmission distance of the QKD with space division multiplexing and without space division multiplexing based on the 4-core multi-core optical fiber, respectively

    Fig. 8. Relationships between the secret key rate and transmission distance of the QKD with space division multiplexing and without space division multiplexing based on the 4-core multi-core optical fiber, respectively

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    Secret key rate of the SDM-QKD running continuously for more than 4 h

    Fig. 9. Secret key rate of the SDM-QKD running continuously for more than 4 h

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    Quantum bit error rate of the SDM-QKD running continuously for more than 4 h

    Fig. 10. Quantum bit error rate of the SDM-QKD running continuously for more than 4 h

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    • Table 1. Inter-core crosstalk coefficients of the 4-core multi-core optical fiber used in experiment

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      Table 1. Inter-core crosstalk coefficients of the 4-core multi-core optical fiber used in experiment

      Inter-core numberCrosstalk coefficient /km-1
      1#-2#3.24×10-7
      2#-3#3.63×10-7
      3#-4#5.01×10-7
      4#-1#2.82×10-7

    • Table 2. Comparison of the QKD performance with space division multiplexing and without space division multiplexing at 21.39 km

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      Table 2. Comparison of the QKD performance with space division multiplexing and without space division multiplexing at 21.39 km

      ParameterWith SDMWithout SDM
      Average of secret key rate /（kbit/s）2.902.92
      Average of quantum bit error rate /%0.880.86

    • Table 3. Comparison of the QKD performance with space division multiplexing and without space division multiplexing at 42.78 km

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      Table 3. Comparison of the QKD performance with space division multiplexing and without space division multiplexing at 42.78 km

      ParameterWith SDMWithout SDM
      Average of secret key rate /（kbit/s）0.750.82
      Average of quantum biterror rate /%2.152.00
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    Liangyuan Zhao, Gonghui Zhang, Wei Sun, Dong Xu, Zheng Wei, Hongyuan Liang, Lin Wang. Space Division Multiplexing Quantum Key Distribution Based on Low Loss Multi-Core Fiber[J]. Acta Optica Sinica, 2024, 44(16): 1627002

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    Paper Information

    Category: Quantum Optics

    Received: Feb. 5, 2024

    Accepted: Apr. 23, 2024

    Published Online: Aug. 2, 2024

    The Author Email: Zhao Liangyuan (zhaoly@htgd.com.cn)

    DOI:10.3788/AOS240615

    CSTR:32393.14.AOS240615

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology