Erlangen 2022 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 54: Quantum Information (Quantum Repeater)
Q 54.1: Talk
Thursday, March 17, 2022, 14:00–14:15, Q-H12
Atom-Atom Entanglement over 33 km Telecom Fiber — •Pooja Malik1,2, Tim van Leent1,2, Matthias Bock3, Florian Fertig1,2, Robert Garthoff1,2, Sebastian Eppelt1,2, Yiru Zhou1,2, Tobias Bauer3, Wei Zhang1,2, Christoph Becher3, and Harald Weinfurter1,2,4 — 1Fakultät für Physik, Ludwig- Maximilians-Universität, Munich, Germany — 2Munich Center for Quantum Science and Technology (MCQST), Munich, Germany — 3Fachrichtung Physik, Universität des Saarlandes, Saarbrücken, Germany — 4Max-Planck Institut für Quantenoptik, Garching, Germany
Scalable quantum networks will allow for secure quantum communication and distributed quantum computing. Heralded entanglement between distant quantum memories is one of the building blocks for such networks. To this end, we present our results of heralded entanglement between two independent quantum memories generated over fiber links with a length of up to 33 km. The two quantum memories consist of a single Rubidium (87Rb) atom each and are located 400 m apart [1]. In order to entangle the two (87Rb) atoms, we start with entangling the spin state of an atom with the polarization state of a photon in each node. The emitted photons (780 nm) are then converted to the low loss telecom S band (1517 nm) to overcome high attenuation loss in optical fiber over longer distances [2]. Finally, these photons are guided to a middle station where a Bell-state measurement swaps the entanglement to the atoms.
[1] T.van Leent et al., arXiv:2111.15526 (2021)
[2] T.van Leent et al., Phys. Rev. Lett. 124, 010510 (2020)