Quantum secure direct communication network with superdense coding and decoy photons

Abstract

A quantum secure direct communication network scheme is proposed with quantum\nsuperdense coding and decoy photons. The servers on a passive optical network\nprepare and measure the quantum signal, i.e., a sequence of the $d$-dimensional\nBell states. After confirming the security of the photons received from the\nreceiver, the sender codes his secret message on them directly. For preventing\na dishonest server from eavesdropping, some decoy photons prepared by measuring\none photon in the Bell states are used to replace some original photons. One of\nthe users on the network can communicate any other one. This scheme has the\nadvantage of high capacity, and it is more convenient than others as only a\nsequence of photons is transmitted in quantum line.\n