@article{Orsi2024CavityMicroscope,
Author = {F. Orsi, N. Sauerwein, R. P. Bhatt, J. Faltinath, E. Fedotova, N. Reiter, T. Cantat-Moltrecht, and J.-P. Brantut},
Title = {Cavity Microscope for Micrometer-Scale Control of Atom-Photon Interactions.},
Journal = {<em>PRX Quantum</em>.},
Year = {(2024).},
Volume = {<strong>5</strong>.},
Number = {(4),},
Pages = {040333},
Note = {article, openaccess, instrumentation},
Doi = {10.1103/PRXQuantum.5.040333},
Url = {https://link.aps.org/doi/10.1103/PRXQuantum.5.040333},
Abstract = {Cavity quantum electrodynamics offers the possibility of observing and controlling the motion of a few or individual atoms, enabling the realization of various quantum technological tasks such as quantum enhanced metrology or quantum simulation of strongly correlated matter. A core limitation of these experiments lies in the mode structure of the cavity field, which is hard coded in the shape and geometry of the mirrors. As a result, most applications of cavity QED trade spatial resolution for enhanced sensitivity. Here, we propose and demonstrate a cavity-microscope device capable of controlling in space and time the coupling between atoms and light in a single-mode high-finesse cavity, reaching a spatial resolution an order of magnitude lower than the cavity-mode waist. This is achieved through local Floquet engineering of the atomic level structure, imprinting a corresponding atom-field coupling. We illustrate this capability by engineering micrometer-scale coupling, using cavity-assisted atomic measurements and optimization. Our system forms an optical device with a single optical axis, has the same footprint and complexity as a standard Fabry-Perot cavity or confocal lens pair, and can be used for any atomic species. This technique opens a wide range of perspectives, from ultrafast cavity-enhanced midcircuit readout to the quantum simulation of fully connected models of quantum matter such as the Sachdev-Ye-Kitaev model.}
}

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