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Cavity QED with neutral atoms
Cavity QED with neutral atoms
Cavities are ideal instruments to study the interaction between a single mode of the electromagnetic field and a two-level atom. For systems in the so-called “strong coupling regime”, entanglement between the light mode and the atom is created leading to intriguing phenomena like the vacuum rabi splitting or the observation of non-classical atomic states.
The setup
Our setup features a fibre-based Fabry-Perot (FFP) cavity on an atom chip, combining the advantages of both systems. Thereby, our setup not only enables single-atom cavity quantum electrodynamics experiments in a simplified setup but also realizes the situation of many atoms in a cavity in form of a BEC, with each particle being identically and strongly coupled to the cavity mode. Moreover, the BEC can be positioned deterministically anywhere within the cavity and localized entirely within a single antinode of the standing-wave cavity field. Because of the small cavity mode volume, we achieve a high coupling constant g=2
*250MHz and cooperativity C=181, which positions our system in the single-atom strong coupling regime.
The images above show the combination of a fibre-based cavity and an atom chip (on the left) and the implementation of this setup in our experiment (on the right). The fibre cavity is fixed above the surface of the atom chip by a ceramic bridge (in white).
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