Two-Way Quantum Time Transfer: A Method for Daytime Space-Earth Links
arxiv(2023)
摘要
High-precision remote clock synchronization is crucial for many classical and
quantum network applications. Evaluating options for space-Earth links, we find
that traditional solutions may not produce the desired synchronization for low
Earth orbits and unnecessarily complicate quantum-networking architectures.
Demonstrating an alternative, we use commercial off-the-shelf quantum-photon
sources and detection equipment to synchronize two remote clocks across our
freespace testbed utilizing a method called two-way quantum time transfer
(QTT). We reach picosecond-scale timing precision under very lossy and noisy
channel conditions representative of daytime space-Earth links and
software-emulated satellite motion. This work demonstrates how QTT is
potentially relevant for daytime space-Earth quantum networking and/or
providing high-precision timing in GPS-denied environments.
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