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Demonstration of quantum network protocols over a 14-km urban fiber link
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abstract
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 $^{40}$Ca$^{+}$ 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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Deployment of Entanglement-Based QKD in Financial Infrastructure
Entanglement-based QKD over a 22 km, 8 dB financial fiber link produced 63.8 kb/s average secure keys for four months at 93.7% uptime and fed a live KMS/VPN.
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