Secure Quantum Secret Sharing without Signal Disturbance Monitoring

TL;DR

This paper introduces a three-user quantum secret sharing protocol that guarantees unconditional security without signal disturbance monitoring, achieving high key rates over long distances and enabling scalable quantum networks.

Contribution

It presents a novel QSS protocol that bypasses the need for disturbance monitoring, breaking existing channel bounds and enabling large-scale secure quantum communication.

Findings

Final key rate exceeds previous bounds.

Transmission distance approaches 600 km.

Protocol ensures unconditional security without disturbance monitoring.

Abstract

Quantum secret sharing (QSS) is an essential primitive for the future quantum internet, which promises secure multiparty communication. However, developing a large-scale QSS network is a huge challenge due to the channel loss and the requirement of multiphoton interference or high-fidelity multipartite entanglement distribution. Here, we propose a three-user QSS protocol without monitoring signal disturbance, which is capable of ensuring the unconditional security. The final key rate of our protocol can be demonstrated to break the Pirandola-Laurenza-Ottaviani-Banchi bound of quantum channel and its simulated transmission distance can approach over 600 km using current techniques. Our results pave the way to realizing high-rate and large-scale QSS networks.