Demonstration of quantum network protocols over a 14-km urban fiber link

• URL: http://arxiv.org/abs/2404.04958v1
• Date: Sun, 7 Apr 2024 13:33:18 GMT
• Title: Demonstration of quantum network protocols over a 14-km urban fiber link
• Authors: Stephan Kucera, Christian Haen, Elena Arenskötter, Tobias Bauer, Jonas Meiers, Marlon Schäfer, Ross Boland, Milad Yahyapour, Maurice Lessing, Ronald Holzwarth, Christoph Becher, Jürgen Eschner,
• Abstract summary: We report on the implementation of quantum entanglement distribution and quantum state teleportation over a 14.4-km urban dark-fiber link. We characterize the link for its use as a quantum channel and realize its active polarization stabilization.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• 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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