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We propose a simultaneous quantum secure direct communication scheme betweenone party and other three parties via four-particle GHZ states and swappingquantum entanglement. In the scheme, three spatially separated senders, Alice,Bob and Charlie, transmit their secret messages to a remote receiver Diana byperforming a series local operations on their respective particles according tothe quadripartite stipulation. From Alice, Bob, Charlie and Diana's Bellmeasurement results, Diana can infer the secret messages. If a perfect quantumchannel is used, the secret messages are faithfully transmitted from Alice, Boband Charlie to Diana via initially shared pairs of four-particle GHZ stateswithout revealing any information to a potential eavesdropper. As there is notransmission of the qubits carrying the secret message in the public channel,it is completely secure for the direct secret communication. This scheme can beconsidered as a network of communication parties where each party wants tocommunicate secretly with a central party or server.Comment: 4 pages, no figur

A Simultaneous Quantum Secure Direct Communication Scheme between the Central Party and OtherMParties