A Single Atom as a Mirror of an Optical Cavity
arXiv:1105.1919 · doi:10.1103/PhysRevLett.107.133002
Abstract
By tightly focussing a laser field onto a single cold ion trapped in front of a far-distant dielectric mirror, we could observe a quantum electrodynamic effect whereby the ion behaves as the optical mirror of a Fabry-Pérot cavity. We show that the amplitude of the laser field is significantly altered due to a modification of the electromagnetic mode structure around the atom in a novel regime in which the laser intensity is already changed by the atom alone. e propose a direct application of this system as a quantum memory for single photons.
7 pages, 3 figures, to appear in Physical Review Letters
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