High cooperativity using a confocal-cavity–QED microscope
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Cavity quantum electrodynamics (QED) with cooperativity far greater than unity enables high-fidelity quantum 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 the near-confocal optical Fabry-Prot cavity, can provide intracavity atomic imaging in addition to high cooperativity. This capability has recently proved important for exploring quantum many-body physics in the driven-dissipative setting. In this work, we show that a confocal-cavity–QED microscope can realize cooperativity in excess of 110. This cooperativity is on par with the very best single-mode cavities (which are far shorter) and 21 times greater than single-mode resonators of similar length and mirror radii. The 1.7-μm imaging resolution is naturally identical to the photon-mediated interaction range. We measure these quantities by determining the threshold of cavity superradiance when small optically tweezed Bose-Einstein condensates are pumped at various intracavity locations. Transmission measurements of an ex situ cavity corroborate these results. We provide a theoretical description that shows how cooperativity enhancement arises from the dispersive coupling to the atoms of many near-degenerate modes.
Kroeze , R M , Marsh , B P , Lin , K-Y , Keeling , J & Lev , B L 2023 , ' High cooperativity using a confocal-cavity–QED microscope ' , PRX Quantum , vol. 4 , no. 2 , 020326 . https://doi.org/10.1103/PRXQuantum.4.020326
DescriptionFunding: The authors acknowledge funding support from the Army Research Office, NTT Research, and the QNEXT DOE National Quantum Information Science Research Center. B.M. acknowledges funding from the Q-NEXT DOE National Quantum Information Science Research Center and the NSF Graduate Research Fellowship.
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