Passive Eavesdropping Attack of Several Intruders on Deterministic Protocol with Pairs of Entangled Qubits

This work presented an analysis of the passive eavesdropping attack of two intruders on the original pingpong protocol with pairs of entangled qubits. A general recursive expression is obtained for the probability of detecting an attack made by random intruders number. It is shown that an increase in the number of intruders in a quantum channel leads to an increase in the probability of their attack detection by legitimate users.