A relay strategy for noisy quantum Ad Hoc network

The path selection is a key problem in noisy quantum Ad Hoc network. In this paper, we propose a relay strategy to find the optimal relay path in Ad Hoc network with a noise model of amplitude damping channel. Based on the analysis of the noise influence on quantum entanglement relay path, we give the calculation method of the entanglement fidelity of a relay path and use this fidelity as the main criterion to choose an optimal relay path. To avoid the congestion of the good relay nodes, we use the number of free entanglement connections to control the choice of a relay path. The details of the relay protocol are given, including the information tables in the quantum nodes, the structure of the protocol messages, the quantum path finding procedures and the path maintenance process. The performance simulation shows our strategy has the ability to find the optimal quantum relay path with better quantum transmission quality.