Phase stochastic resonance in coherent QKD signal transmission with a crosstalk noise in multicore fiber

TL;DR

This paper investigates phase stochastic resonance in quantum key distribution systems, showing how classical signal phase noise can optimize quantum signal transmission in multicore fibers.

Contribution

It introduces the concept of phase stochastic resonance in QKD with multicore fibers, revealing how phase noise can enhance quantum signal quality.

Findings

Maximum SNR occurs at specific phase noise levels.

Transmission parameters can be optimized to reduce interference.

Phase noise dependence varies with signal wavelength.

Abstract

The study considers the new effect of phase stochastic resonance in a linear system with multiple external signals that can influence quantum communication. The phase stochastic resonance was shown in a linear co-propagation of the quantum and multiple classical signals in the multicore fiber of the quantum channel of Quantum Key Distribution (QKD). The dependence of SNR vs phase noise of classical signal could have a maximum at a certain range of phase noise depending on the wavelength of the signals. The results determine the set of transmission parameters that would produce less interference with the quantum signal in QKD systems.