Journal
PHYSICAL REVIEW X
Volume 8, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevX.8.041055
Keywords
Atomic and Molecular Physics; Quantum Physics; Quantum Information
Categories
Funding
- Institute for Quantum Information and Matter, an NSF Physics Frontiers Center (NSF) [PHY-1733907]
- NSF CAREER grant [1753386]
- NASA/JPL President's and Director's Fund
- Sloan Foundation
- IQIM Postdoctoral Fellowship
- PMA Postdoctoral Prize Fellowship
- U.S. Department of Commerce, National Institute of Standards and Technology
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We demonstrate single-shot imaging and narrow-line cooling of individual alkaline-earth atoms in optical tweezers; specifically, strontium trapped in 515.2-nm light. Our approach enables high-fidelity detection of single atoms by imaging photons from the broad singlet transition while cooling on the narrow intercombination line, and we extend this technique to highly uniform two-dimensional tweezer arrays with 121 sites. Cooling during imaging is based on a previously unobserved narrow-line Sisyphus mechanism, which we predict to be applicable in a wide variety of experimental situations. Further, we demonstrate optically resolved sideband cooling of a single atom to near the motional ground state of a tweezer, which is tuned to a magic-trapping configuration achieved by elliptical polarization. Finally, we present calculations, in agreement with our experimental results, that predict a linear-polarization and polarization-independent magic crossing at 520(2) nm and 500.65(50) nm, respectively. Our results pave the way for a wide range of novel experimental avenues based on individually controlled alkaline-earth atoms in tweezers-from fundamental experiments in atomic physics to quantum computing, simulation, and metrology.
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