SAMOP 2023 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 1: Quantum Technologies (joint session Q/A/QI)
Q 1.3: Talk
Monday, March 6, 2023, 11:30–11:45, A320
Tomography of distant single Atoms — •Florian Fertig1,2, Yiru Zhou1,2, Pooja Malik1,2, Anastasia Reinl1,2, Tim van Leent1,2, and Harald Weinfurter1,2,3 — 1Fakultät für Physik, Ludwig-Maximilians-Universität, Munich, Germany — 2Munich Center for Quantum Science and Technology (MCQST), Munich, Germany — 3Max-Planck-Institut für Quantenoptik, Garching, Germany
Entanglement of distant quantum memories forms the building block of quantum networks. Neutral atoms with long coherence times are possible candidates for such a quantum network link and can be entangled via the entanglement swapping protocol. Our experiment consists of two nodes, currently 400 m apart, employing single optically trapped Rubidium-87 atoms as quantum memories. A new collection setup allows for an increased entanglement event rate of 1/6 Hz allowing a state analysis and reconstruction of the entangled state.
Here, we use quantum state tomography for the first time on atom-atom entanglement and evaluate the influence of different kind of experimental improvements on the fidelity of the entangled state. We introduce time-filtering, a method to increase the atom-atom entanglement fidelity. At the cost of events we reach a fidelity > 90% well suited for demanding tasks like device-independent QKD.