AI 中文总结
该研究在模拟星地信道中演示了基于纠缠的QSTT系统，其QKD密钥率较墨子号提升30倍，还具备无GPS同步等创新特性，实现了更高效安全的空间量子安全时间传输。
AI 中文摘要
我们利用基于0型萨格纳克结构的纠缠光子源，在模拟低地球轨道星地信道中实验演示了基于纠缠的量子安全时间传输（Quantum-Secure Time Transfer, QSTT）系统。该新型QSTT系统在$10^{-10}$安全参数下实现了约$3$比特/秒的有限密钥量子密钥分发（Quantum Key Distribution, QKD）密钥率，与墨子号卫星所实现的基于纠缠的QKD系统相比，密钥率提升了30倍。除高密钥率外，该QSTT系统的创新点包括无需GPS的时钟同步、QKD的优化使用、内置后量子安全性，以及通过预共享密钥对系统配置进行混淆。这些改进共同实现了迄今为止最高效、最安全的QSTT部署，为空间高精度超安全时间传输指明了方向。
英文摘要
We experimentally demonstrate an entanglement-based Quantum-Secure Time Transfer (QSTT) system in an emulated low Earth orbit satellite-to-ground channel using a type-0 Sagnac-based entangled-photon source. Our new QSTT system delivers a finite Quantum Key Distribution (QKD) key rate of approximately $3~$bits$~\text{s}^{-1}$ with a $10^{-10}$ security parameter, providing a $30$-fold increase in the QKD key rate compared to the state-of-the-art entanglement-based QKD system delivered by the Micius satellite. Beyond this high key rate outcome, novel to our QSTT system is a GPS-free clock synchronization, optimized use of QKD, embedded post-quantum security, and obfuscation of the system configuration via use of a pre-shared key. Collectively, these enhancements deliver the most efficient and secure deployment of QSTT to date, and point the way forward to high-accuracy ultra-secure time transfer in space.
Comments11 pages, 7 figures, 2 tables
