Quantum Noise on the Coherent-transport Protocol for Clock Synchronization

The paper presents the synchronization accuracies of the coherent-transport protocol in the presence of quantum noise. Under the influence of bit flip noise, the accuracy will reduce to the standard quantum limit. When influenced by phase flip and amplitude damping, the accuracies are lower than the standard quantum limit in most cases. By comparison to the performance of the one-qubit transport protocol and the entangled-states transport protocol, we found the accuracy of the coherent-transport protocol to be lower than the accuracies of the other two protocols in the presence of phase flip and amplitude damping.