Member expansion in quantum (t,n) threshold secret sharing schemes

A protocol for member expansion in quantum (t,n) threshold secret sharing schemes was proposed. Without a trusted center and modifying the shares of old participants, the protocol needs that t (t is the threshold) old participants cooperate to generate the new share. Compared with the previous secret sharing protocols, the proposed protocol has the advantage of joining new participants agilely.

Research Highlights
► We propose a protocol for member expansion in quantum (t,n) threshold secret sharing schemes.
► The protocol needs that t (t is the threshold) old participants cooperate to generate the new share.
► The protocol needs not any trusted center and does not modify the shares of old participants.
► The proposed protocol has the advantage of joining new participants agilely.