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Q: Fachverband Quantenoptik und Photonik

Q 60: Quantum Effects (Cavity QED)

Q 60.2: Talk

Friday, March 13, 2020, 11:15–11:30, f442

Multi-atom scaling of light-matter interactions in a fiber-coupled cavity — •Fabian Spallek and Stefan Yoshi Buhmann — Physikalisches Institut, Freiburg i.Br., Germany

The coupling of tightly controlled single resonant photons and transitions in neutral atoms in open fiber cavities allows for strongly coupled, highly coherent collective light-matter interaction rates. They could provide a high cooperativity, high-bandwidth, fiber-coupled channel for photonic interfaces such as quantum memories and single-photon sources [1]. We use methods from macroscopic Quantum Electrodynamic (QED) and Cavity-QED to investigate how the light-atom interactions depend on the positioning of the atoms with respect to the mode, which can be controlled by an optical dipole trap [2][3]. In this way, we can predict the collective Rabi frequency and the quantitative scaling of the observed Purcell enhancement for a given collection of trapped atoms. Similarities of these collective effects to superradiance in other settings are discussed.
[1] J. Gallego, W. Alt, T. Macha, M. Martinez-Dorantes, D. Pandey, and D. Meschede, Strong Purcell Effect on a Neutral Atom Trapped in an Open Fiber Cavity, Phys. Rev. Lett. 121, 173603, (2018)
[2] S. Esfandiarpour, H. Safari, R. Bennett, and S. Y. Buhmann, Cavity-QED Interactions of Two Correlated Atoms, J. Phys. B: At. Mol. Opt. Phys. 51, 094004, (2018)
[3] S. Esfandiarpour, H. Safari, and S.Y . Buhmann, Cavity-QED Interactions of Several Atoms, J. Phys. B: At. Mol. Opt. Phys. 52, 085503, (2019)