High Cooperativity Using a Confocal-Cavity–QED Microscope

Kroeze, Ronen M.; Marsh, Brendan P.; Lin, Kuan-Yu; Keeling, Jonathan; Lev, Benjamin L.

doi:10.1103/prxquantum.4.020326

High Cooperativity Using a Confocal-Cavity–QED Microscope

Journal Article · Thu May 11 00:00:00 EDT 2023 · PRX Quantum

DOI:https://doi.org/10.1103/prxquantum.4.020326· OSTI ID:2423787

Kroeze, Ronen M. ^[1]; Marsh, Brendan P. ^[1]; Lin, Kuan-Yu ^[1]; ^[2]; ^[1]

Stanford University, CA (United States)
University of St. Andrews, Scotland (United Kingdom)

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-Pérot 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 BoseEinstein 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.

View Accepted Manuscript (DOE)

Research Organization:: National Quantum Information Science (QIS) Research Centers (United States). Next Generation Quantum Science and Engineering (Q-NEXT)

Sponsoring Organization:: National Science Foundation (NSF); US Army Research Office (ARO); USDOE

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 2423787

Journal Information:: PRX Quantum, Journal Name: PRX Quantum Journal Issue: 2 Vol. 4; ISSN 2691-3399

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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