Semiquantum secret sharing by using χ-type states
College of Information and Electronic Engineering, Zhejiang Gongshang University, 310018, Hangzhou, People’s Republic of China
Accepted: 21 November 2022
Published online: 10 December 2022
In this paper, a semiquantum secret sharing (SQSS) protocol based on χ-type states is proposed, which can accomplish the goal that only when two classical communicants cooperate together can they extract the shared secret key of a quantum communicant. Detailed security analysis turns out that this protocol is completely robust against an eavesdropper. This protocol has some merits: (1) it only requires one kind of quantum entangled state as the initial quantum resource; (2) it does not employ quantum entanglement swapping or unitary operations; and (3) it need not share private keys among different participants beforehand.
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