Experimental Efficient Source-Independent Quantum Conference Key Agreement

TL;DR

This paper demonstrates a scalable, efficient source-independent quantum conference key agreement protocol using polarization-entangled photons in a three-user network, achieving high secure key rates and exploring scalability factors.

Contribution

It introduces a practical, scalable implementation of SI-QCKA with polarization-entangled photons, overcoming previous technical challenges and analyzing key rate dependencies.

Findings

Achieved a secure key rate of 2.11 x 10^4 bits/s

Demonstrated scalability potential for large quantum networks

Investigated effects of channel loss and basis probability on key rates

Abstract

Multipartite entanglement enables secure group key distribution among multiple users while providing immunity against hacking attacks targeting source devices, thereby realizing source-independent quantum conference key agreement (SI-QCKA). However, previous experimental demonstrations of SI-QCKA have encountered substantial technical challenges, primarily due to the low efficiency and scalability limitations inherent in the generation and distribution of multipartite entanglement. Here, we experimentally demonstrate a scalable and efficient SI-QCKA protocol using polarization-entangled photon pairs in a three-user star network, where Greenberger-Horne-Zeilinger correlations are realized via a post-matching method. We achieve a secure group key rate of $2.11 \times 10^{4}$ bits/s under the single-user channel transmission of 1.64 $\times$ $10^{-1}$ in a symmetric channel loss network. Additionally, we conduct six sets of experiments to investigate the impact of varying channel transmission and random basis selection probabilities on secure key rates. Our work establishes an efficient pathway for SI-QCKA and demonstrates potential scalability for future large-scale multi-user quantum networks.