Freiburg 2024 – scientific programme

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A: Fachverband Atomphysik

A 25: Poster IV

A 25.20: Poster

Wednesday, March 13, 2024, 17:00–19:00, Tent A

A cavity-microscope for micrometer-scale control of atom-photon interactions — •Ekaterina Fedotova, Francesca Orsi, Rohit Bhatt, Jonas Faltinath, Gaia Bolognini, Nick Sauerwein, and Jean-Philippe Brantut — Institute of Physics and Center for Quantum Science and Engineering, EPFL, Lausanne, Switzerland

Cavity quantum-electrodynamics enables measurements of atoms with sensitivity limited by quantum backaction. Over the last decade, the possibility to observe and control the motion of few or individual atoms using cavity-enhanced light-matter coupling has been exploited to realize various quantum technological tasks. A principle limitation of these experiments lies in the mode structure of the cavity, which is hard-coded in the distance and geometry of the mirrors, effectively trading spatial resolution for enhanced sensitivity.

In this poster, I will present our cavity-microscope device allowing for spatio-temporal programming of the light-matter coupling of atoms in a high finesse cavity. This is achieved through local Floquet engineering of the atomic structure, imprinting a corresponding light-matter coupling. We illustrate this capability by engineering micrometer-scale coupling, using cavity-assisted atomic measurements and optimization. Our system has the same footprint and complexity as a standard Fabry-Perot cavities or confocal lens pairs, and can be used for any atomic species. This technique opens a wide range of perspectives from ultra-fast, cavity-enhanced mid-circuit readout to the quantum simulation of fully connected models of quantum matter such as the Sachdev-Ye-Kitaev model.