Dynamic Multiparty Quantum Secret Sharing With a Trusted Party Based on Generalized GHZ State

This paper proposes a dynamic multiparty to multiparty quantum secret sharing scheme, where two distant groups of participants can share the common secrets. In our present scheme, a trusted third party is required to reliably prepare all quantum resources. Each agent only needs to perform the local unitary operations or single-particle measurement completing the process of secret sharing. Secret can be recovered only if all agents cooperate each other. Furthermore, a new agent can be added or deleted from the current scheme with the help of the trusted third party. Finally, security analysis shows that our scheme can resist various common attacks. Compared to former existing researches, our scheme can be more efficient in real application.