Breaking universal limitations on quantum conference key agreement without quantum memory
Chen-Long Li, Yao Fu, Wen-Bo Liu, Yuan-Mei Xie, Bing-Hong Li, Min-Gang, Zhou, Hua-Lei Yin, Zeng-Bing Chen

TL;DR
This paper introduces a measurement-device-independent quantum conference key agreement protocol that significantly improves transmission efficiency and distance without requiring quantum memory, advancing practical quantum networks.
Contribution
It presents a novel protocol leveraging spatial multiplexing and adaptive operations to surpass key rate bounds in lossy channels without quantum memory.
Findings
Enhanced key rate and transmission distance over lossy channels.
Security analysis confirms robustness in the composable framework.
Practical performance demonstrated in finite-size regime.
Abstract
Quantum conference key agreement is an important cryptographic primitive for future quantum network. Realizing this primitive requires high-brightness and robust multiphoton entanglement sources, which is challenging in experiment and unpractical in application because of limited transmission distance caused by channel loss. Here we report a measurement-device-independent quantum conference key agreement protocol with enhanced transmission efficiency over lossy channel. With spatial multiplexing nature and adaptive operation, our protocol can break key rate bounds on quantum communication over quantum network without quantum memory. Compared with previous work, our protocol shows superiority in key rate and transmission distance within the state-of-the-art technology. Furthermore, we analyse the security of our protocol in the composable framework and evaluate its performance in the…
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Taxonomy
TopicsQuantum Information and Cryptography · Quantum Mechanics and Applications · Quantum Computing Algorithms and Architecture
