Abstract
We propose a simultaneous quantum secure direct communication schemebetween one party and other three parties via four-particle GHZ statesand swapping quantum entanglement. In the scheme, three spatiallyseparated senders, Alice, Bob and Charlie, transmit their secretmessages to a remote receiver Diana by performing a series of localoperations on their respective particles according to the quadripartitestipulation. From Alice, Bob, Charlie and Diana's Bell measurementresults, Diana can infer the secret messages. If a perfect quantumchannel is used, the secret messages are faithfully transmitted fromAlice, Bob and Charlie to Diana via initially shared pairs offour-particle GHZ states without revealing any information to apotential eavesdropper. As there is no transmission of the qubitscarrying the secret message in the public channel, it is completelysecure for the direct secret communication. This scheme can beconsidered as a network of communication parties where each party wantsto communicate secretly with a central party or server.
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