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Timing requirements for long-range quantum networking are driven by thenecessity of synchronizing the arrival of photons, from independent sources,for Bell-state measurements. Thus, characteristics such as repetition rate andpulse duration influence the precision required to enable quantum networkingtasks such as teleportation and entanglement swapping. Some solutions have beenproposed utilizing classical laser pulses, frequency combs, and biphotonsources. In this article, we explore the utility of the latter method since itis based upon quantum phenomena, which makes it naturally covert, andpotentially quantum secure. Furthermore, it can utilize relatively lowperformance quantum-photon sources and detection equipment, but providespicosecond-level timing precision even under high loss and high noise channelconditions representative of daytime space-Earth links. Therefore, this methodis relevant for daytime space-Earth quantum networking and/or providinghigh-precision secure timing in GPS denied environments.

Quantum time transfer: a practical method for lossy and noisy channels