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In this paper, we propose a secure Quantum Secret Sharing protocol among participants which are far from each other and there is no secure channel between them to reconstruct the secret. This protocol doesn't need any entanglement states or unitary operations. Each participant performs rotations and finally measures single states.
In this paper, a novel deterministic secure quantum communication scheme with four-qubit W states is proposed. By utilizing four kinds of unitary operations, the two legitimate users can directly transmit the secret messages based on the Bell measurements and some additional classical information. Analysis shows that our scheme has a high capacity as each W state can carry two bits of secret information,...
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