Journal
PHYSICAL REVIEW LETTERS
Volume 116, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.116.113001
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Funding
- NSF PIF
- AFOSR
- ARO
- ARL-CDQI
- NSF PFC at JQI
- Direct For Mathematical & Physical Scien
- Division Of Physics [1430094] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1415616] Funding Source: National Science Foundation
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We observe interaction-induced broadening of the two-photon 5s-18s transition in Rb-87 atoms trapped in a 3D optical lattice. The measured linewidth increases by nearly 2 orders of magnitude with increasing atomic density and excitation strength, with corresponding suppression of resonant scattering and enhancement of off-resonant scattering. We attribute the increased linewidth to resonant dipole-dipole interactions of 18s atoms with blackbody induced population in nearby np states. Over a range of initial atomic densities and excitation strengths, the transition width is described by a single function of the steady-state density of Rydberg atoms, and the observed resonant excitation rate corresponds to that of a two-level system with the measured, rather than natural, linewidth. The broadening mechanism observed here is likely to have negative implications for many proposals with coherently interacting Rydberg atoms.
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