Journal
PHYSICAL REVIEW LETTERS
Volume 102, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.102.183601
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Funding
- Austrian Science Fund FWF [SFB F-015]
- Institut fur Quanteninformation GmbH
- European Commission [MRTN-CT2006-035369]
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We report measurements of an intensity-field correlation function of the resonance fluorescence of a single trapped Ba-138(+) 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 nonclassical behavior. In the setup, an interference measurement is conditioned on the detection of a fluorescence photon.
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