Semi-quantum secret sharing using entangled states

TL;DR

This paper introduces semi-quantum secret sharing protocols using entangled GHZ states, enabling a quantum Alice to securely share secrets with classical parties Bob and Charlie, ensuring only qualified subsets can reconstruct the secret.

Contribution

It proposes novel semi-quantum secret sharing protocols utilizing entangled states, bridging quantum and classical participants in secure secret sharing.

Findings

Protocols are secure against eavesdropping.

Both classical parties are sufficient to reconstruct the secret.

The protocols work with maximally entangled GHZ states.

Abstract

Secret sharing is a procedure for sharing a secret among a number of participants such that only the qualified subsets of participants have the ability to reconstruct the secret. Even in the presence of eavesdropping, secret sharing can be achieved when all the members are quantum. So what happens if not all the members are quantum? In this paper we propose two semi-quantum secret sharing protocols using maximally entangled GHZ-type states in which quantum Alice shares a secret with two classical parties, Bob and Charlie, in a way that both parties are sufficient to obtain the secret, but one of them cannot. The presented protocols are also showed to be secure against eavesdropping.