Strong interaction between light and a single trapped atom without a cavity

Details Strong interaction between light and a single trapped atom without a cavity Strong interaction between light and a single trapped atom without a cavity

2008-02-21

arxiv.org/abs/0802.3005v3

Nature Physics 4, 924-927 (2008)

Physics

Quantum Physics

11 pages, 4 figures

Scientific paper

10.1038/nphys1096

Coupling of light to an atom at single quanta level with high probability is a building block for many quantum information processing protocols. It is commonly believed that efficient coupling is only achievable with the assistance of a cavity. Here, we report on an observation of substantial coupling between a light beam and a single $^{87}$Rb atom in a direct extinction measurement by focusing light to a small spot with a single lens. Our result opens a new perspective on processing quantum information carried by light using atoms, and is important to many ongoing experiments that require strong coupling of single photons to an atom in free space.

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