Freiburg 2024 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 31: Quantum Communication IV
Q 31.2: Vortrag
Mittwoch, 13. März 2024, 11:15–11:30, HS 3219
A scalable quantum register for multiplexed atom-photon entanglement — •Lukas Hartung1, Matthias Seubert1, Stephan Welte2, Emanuele Distante1, and Gerhard Rempe1 — 1Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching — 2ETH Zürich, Otto-Stern-Weg 1, 8093 Zürich
Trapped atoms in the centre of a cavity have been used for the efficient generation of atom-photon entanglement[1]. However, in past experiments the number of atoms in the resonator was limited to at most two[2], as the loading of individual atoms was based on probabilistic schemes. To overcome this limitation, we have extended our setup with an addressing system that allows to load presently up to six atoms into the cavity using optical tweezers. Additionally, the system enables individual addressing of the atoms to generate atom-photon entangled pairs via a vaccum STIRAP[3]. We show that the fidelity of this entanglement process is independent of the number and spatial arrangement of the atoms, which is an indicator of the scalability of our system. Finally, we use the setup to generate atom-photon entanglement in a multiplexed way with an efficiency of up to 88.6(1)%.
[1] Philip Thomas et al., Efficient generation of entangled multiphoton graph states from a single atom. Nature 608, 677-681 (2022).
[2] Stephan Welte et al., Photon-Mediated Quantum Gate between Two Neutral Atoms in an Optical Cavity, Phys. Rev. X 8, 011-018 (2018).
[3] Tatjana Wilk et al., Single-Atom Single-Photon Quantum Interface. Science 317, 488-490 (2007).
Keywords: Optical tweezers; Atom-photon entanglement; Multiplexing; quantum network node