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.
@article{arxiv.2104.10321,
title = {Secure Quantum Secret Sharing without Signal Disturbance Monitoring},
author = {Hua-Lei Yin and Jie Gu and Yuan-Mei Xie and Wen-Bo Liu and Yao Fu and Zeng-Bing Chen},
journal= {arXiv preprint arXiv:2104.10321},
year = {2021}
}