Efficient quantum secret sharing without a trusted player

Quantum secret sharing (QSS) is a fundamental primitive in quantum cryptography. The complex and secure multiparty quantum protocols can be built using QSS. The existing QSS protocols are either (n, n) threshold 2-level or (t, n) threshold d-level with a trusted player, where n denotes the number of players and t denotes the threshold number of players. Here, we propose a secure d-level QSS protocol for sharing a secret, where t players can reconstruct the secret without a trusted player. This protocol is more secure, flexible, and practical as compared to the existing QSS protocols: (n, n) threshold 2-level and (t, n) threshold d-level with a trusted player. Further, it does not disclose any information about the secret to players. Its security analysis shows that the intercept-resend, intercept, entangle-measure, forgery, collision and collusion attacks are not possible in this protocol.