期刊
PHYSICAL REVIEW LETTERS
卷 110, 期 26, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.263201
关键词
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资金
- DGA
- EU (ERC Stg Grant ARENA)
- EU (AQUTE Integrating Project)
- EU (Initial Training Network COHERENCE)
- Region Ile-de-France (LUMAT)
- Region Ile-de-France (Triangle de la Physique)
We report the direct measurement of the van der Waals interaction between two isolated, single Rydberg atoms separated by a controlled distance of a few micrometers. Working in a regime where the single-atom Rabi frequency for excitation to the Rydberg state is comparable to the interaction, we observe partial Rydberg blockade, whereby the time-dependent populations of the various two-atom states exhibit coherent oscillations with several frequencies. Quantitative comparison of the data with a simple model based on the optical Bloch equations allows us to extract the van der Waals energy, and observe its characteristic C-6/R-6 dependence. The measured C-6 coefficients agree well with ab initio calculations, and we observe their dramatic increase with the principal quantum number n of the Rydberg state.
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