Abstract
The study discusses a linear co-propagation of the quantum signal of the Quantum Key Distribution (QKD) system and multiple classical signals in the multicore fiber. The crosstalk from the neighboring core produces noise in the quantum channel. For the first time, the phase stochastic resonance was shown in the quantum network system. The dependence of SNR vs phase noise of crosstalk signal could have a maximum at a certain range of phase noise. The maximum depends on the wavelength of the classical signals that produce the crosstalk. A set of transmission parameters that are close to the SNR maximum can be chosen that will improve the performance of the quantum network systems.
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