Demonstration of quantum network protocols over a 14-km urban fiber link
arxiv(2024)
摘要
We report on the implementation of quantum entanglement distribution and
quantum state teleportation over a 14.4-km urban dark-fiber link, which is
partially underground, partially overhead, and patched in several stations. We
characterize the link for its use as a quantum channel and realize its active
polarization stabilization. Using a type-II cavity-enhanced SPDC photon pair
source, a ^40Ca^+ single-ion quantum memory, and quantum frequency
conversion to the telecom C-band, we demonstrate photon-photon entanglement,
ion-photon entanglement, and teleportation of a qubit state from the ion onto a
remote telecom photon, all realized over the urban fiber link.
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