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Andres Ruiz-Chamorro1, Aida Garcia-Callejo2, Veronica Fernandez2

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A new pilot tone algorithm enhances frequency locking in continuous variable quantum key distribution (CV-QKD). This method improves stability and allows for secure key rates up to 1 Mb/s over 50 km fiber.

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Area of Science:

  • Quantum Information Science
  • Quantum Communication Security
  • Optical Engineering

Background:

  • Continuous Variable Quantum Key Distribution (CV-QKD) faces challenges with precise frequency synchronization between lasers.
  • Accurate frequency locking is crucial for reliable symbol demodulation and secure key exchange.
  • Existing CV-QKD systems struggle with maintaining sender-receiver frequency synchronization, impacting efficiency.

Purpose of the Study:

  • To introduce and validate a novel pilot tone-assisted frequency locking algorithm for CV-QKD.
  • To enhance the stability of CV-QKD systems utilizing a locally generated local oscillator (LLO).
  • To develop a low-complexity, high-rate CV-QKD solution without requiring fast electronic stabilization.

Main Methods:

  • Implementation of a pilot tone-assisted frequency locking algorithm.
  • Leveraging software-based optimization techniques for frequency synchronization.
  • Empirical validation of the proposed algorithm in a CV-QKD setup.

Main Results:

  • The pilot tone algorithm effectively mitigates phase fluctuations and preserves quantum signal integrity.
  • The system achieved stable frequency synchronization without time-multiplexed reference pulses or fast laser electronics.
  • Demonstrated potential for secure key rates up to 1 Mb/s over 50 km of single-mode fiber.

Conclusions:

  • The pilot tone-assisted frequency locking algorithm offers a robust solution for CV-QKD synchronization.
  • This approach enables high-rate, low-complexity CV-QKD implementations under realistic conditions.
  • The findings pave the way for more practical and efficient quantum key distribution systems.