A quantum secret sharing scheme among three parties ultilizing four-qubit Smolin bound entangled state

摘要

Four-qubit Smolin bound entangled state has a distinct feature: the state isnot distillable when every qubit is seperated from each other; but it makes twoseparated qubit entangled if the other qubits group together. Here the featureis applied to quantum secret sharing, a QSS protocol similar to Ekert 91protocol of QKD is proposed. The security problem, disadvantage and advantageofthis protocol are disscused.