CLOCK SYNCHRONIZATION SYSTEM BASED ON QUANTUM ENTANGLEMENT, AND METHOD

摘要

The present invention discloses a clock synchronization system based on quantum entanglement, and a method, comprising: an entanglement source unit, a transmission unit, a clock synchronization unit Alice, a clock synchronization unit Bob and a measurement unit; the present invention uses single-polarization-state entangled photons as synchronization signal carriers, uses a Faraday mirror and a bidirectional path for the automatic compensation of polarization jitter in an optical fiber, uses a 790nm laser pump type II phase matching crystal for forming similar-frequency entangled photon pairs, and uses an electrically-controllable optical delay line for precisely controlling the delay of two optical paths, obtaining a Hong-Ou-Mandel (HOM) maximum dip value between two parties awaiting clock synchronization, and thus obtaining an accurate time difference using an intermediate unit as a reference, and achieving the clock synchronization of two parties by directly measuring entangled photons.