Tennessee Researchers Achieve 99.99% Clock Sync Over 10km
Researchers from The University of Tennessee have made a significant breakthrough in clock synchronization. Led by Noah Crum, Md Mehdi Hassan, and George Siopsis, the team has achieved synchronization fidelity exceeding 99.99% over a distance of 10 kilometres.
The team's novel approach involves establishing entanglement between remote clocks and using measurements on these entangled states to estimate and correct timing differences. They demonstrated the use of attenuated, weak coherent pulses combined with bidirectional Hong-Ou-Mandel interferometry, achieving sub-nanosecond precision in clock offset accuracy and precision.
The team successfully demonstrated clock synchronization over a 7-kilometre fibre optic link, paving the way for robust and accurate time synchronization infrastructure in future quantum networks and distributed quantum computing. The security of the synchronization process can be enhanced by selecting specific polarization states, as revealed by the team's security analysis.
This breakthrough offers a pathway to flexible and secure time distribution, essential for advanced quantum networks and applications demanding picosecond-level timing. The work establishes a viable pathway towards building robust and accurate time synchronization infrastructure for future quantum networks and distributed quantum computing.
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