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This study experimentally validates a high-rate, GPS-free quantum time transfer system in an emulated satellite environment, marking a significant leap toward ultra-secure space-based synchronization. By achieving a 30-fold increase in key rates over previous benchmarks while integrating post-quantum security and configuration obfuscation, the research addresses critical vulnerabilities in current global positioning infrastructure. These advancements demonstrate a viable pathway for deploying robust quantum networks that ensure precise timing and communication integrity in orbit.
Quantum Secure Time Transfer for Satellites
arXiv:2608.24092v1 Announce Type: new Abstract: 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.
Abstract: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.
arXiv:2608.24092 [quant-ph]
(or arXiv:2608.24092v1 [quant-ph] for this version)
https://doi.org/10.48550/arXiv.2608.24092 Focus to learn more arXiv-issued DOI via DataCite (pending registration)
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