Forces between a single atom and its distant mirror image

Details Forces between a single atom and its distant mirror image Forces between a single atom and its distant mirror image

2003-11-05

arxiv.org/abs/quant-ph/0311023v2

Phys. Rev. Lett. 92, 223602 (2004)

Physics

Quantum Physics

4 pages, 5 figures, published version

Scientific paper

10.1103/PhysRevLett.92.223602

An excited-state atom whose emitted light is back-reflected by a distant mirror can experience trapping forces, because the presence of the mirror modifies both the electromagnetic vacuum field and the atom's own radiation reaction field. We demonstrate this mechanical action using a single trapped barium ion. We observe the trapping conditions to be notably altered when the distant mirror is shifted by an optical wavelength. The well-localised barium ion enables the spatial dependence of the forces to be measured explicitly. The experiment has implications for quantum information processing and may be regarded as the most elementary optical tweezers.

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