High Cooperativity Using a Confocal-Cavity–QED Microscope

Cavity quantum electrodynamics (QED) with cooperativity far greater than unity enables high-fidelity sensing and information processing. The high-cooperativity regime is often reached through the use of short single-mode resonators. More complicated multimode resonators, such as near-confocal optical Fabry-Prot cavity, can provide intracavity atomic imaging in addition to high cooperativity. This capability has recently proved important for exploring many-body physics driven-dissipative setting. In this work, we show that a confocal-cavity–QED microscope realize excess 110. on par very best cavities (which are shorter) 21 times resonators similar length mirror radii. 1.7-μm resolution naturally identical photon-mediated interaction range. We measure these quantities by determining threshold cavity superradiance when small optically tweezed Bose-Einstein condensates pumped at various locations. Transmission measurements an ex situ corroborate results. theoretical description shows how enhancement arises from dispersive coupling atoms many near-degenerate modes.Received 15 December 2022Accepted 11 April 2023DOI:https://doi.org/10.1103/PRXQuantum.4.020326Published American Physical Society under terms Creative Commons Attribution 4.0 International license. Further distribution work must maintain attribution author(s) published article's title, journal citation, DOI.Published SocietyPhysics Subject Headings (PhySH)Research AreasBose-Einstein condensatesCavity electrodynamicsTechniquesCavity resonatorsOptical microscopyAtomic, Molecular & OpticalQuantum Information