Journal
NEW JOURNAL OF PHYSICS
Volume 22, Issue 12, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/abcdc8
Keywords
cold atoms; optical lattice; laser cooling; quantum gas microscope; frustrated magnetism; machine learning
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Funding
- JSPS KAKENHI [JP19H01854]
- ImPACT Programme of Council for Science, Technology and Innovation (Cabinet Office, Government of Japan)
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We demonstrate single-site-resolved fluorescence imaging of ultracold Rb-87 atoms in a triangular optical lattice by employing Raman sideband cooling. Combining a Raman transition at the D1 line and a photon scattering through an optical pumping of the D2 line, we obtain images with low background noise. The Bayesian optimisation of 11 experimental parameters for fluorescence imaging with Raman sideband cooling enables us to achieve single-atom detection with a high fidelity of (96.3 +/- 1.3)%. Single-atom and single-site resolved detection in a triangular optical lattice paves the way for the direct observation of spin correlations or entanglement in geometrically frustrated systems.
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