We report measurements of an intensity-field correlation function of the resonance fluorescence of a single trapped Ba+ ion. Detection of a photon prepares the atom in its ground state and we observe its subsequent evolution under interaction with a laser field of well defined phase. We record the regression of the resonance fluorescence source field. This provides a direct measurement of the field of the radiating dipole of a single atom and exhibits its strong non-classical behavior. In the experimental setup an interference measurement is conditioned on a fluorescence photon detection. The third-order correlation function thus recorded demonstrates an aspect of wave-particle duality at the single-atom, single-photon level.
@article{arxiv.0901.3979,
title = {Intensity-field correlation of single-atom resonance fluorescence},
author = {S. Gerber and D. Rotter and L. Slodicka and J. Eschner and H. J. Carmichael and R. Blatt},
journal= {arXiv preprint arXiv:0901.3979},
year = {2015}
}