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Wavelength Assignment in Hybrid Quantum-Classical Networks.

Sima Bahrani1,2, Mohsen Razavi3, Jawad A Salehi4

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This summary is machine-generated.

Optimizing wavelength assignment in dense-wavelength-division-multiplexing (DWDM) systems improves quantum key distribution (QKD) by reducing noise. Interspersed quantum and classical channels significantly boost secret key rates.

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Area of Science:

  • Optical communications
  • Quantum information science

Background:

  • Dense-wavelength-division-multiplexing (DWDM) systems face challenges integrating quantum key distribution (QKD) with classical channels.
  • Weak QKD signals are susceptible to masking by background noise from intense classical signals on shared fibers.

Purpose of the Study:

  • To investigate optimal wavelength assignment strategies for DWDM systems combining quantum and classical channels.
  • To mitigate noise interference and enhance the performance of QKD.

Main Methods:

  • Analysis of different DWDM structures and crosstalk sources.
  • Development and evaluation of near-optimal wavelength assignment methods.
  • Numerical simulations to assess secret key rates.

Main Results:

  • Optimal wavelength assignment involves interspersing quantum and classical bands.
  • Proposed methods substantially improve total secret key rates in noise-dominated regimes.
  • Achieved maximization of QKD users under specific key rate constraints.

Conclusions:

  • Strategic wavelength assignment is crucial for effective integration of QKD in DWDM systems.
  • The proposed methods offer significant performance gains over conventional approaches.
  • This research provides a pathway to scalable and secure quantum communication networks.