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Europhysics Letters (EPL)

Statistical investigations on single trapped neutral atoms

F. Ruschewitz, D. Bettermann, Jin-Long Peng, Wolfgang A. Ertmer

Published Jun 20, 1996• 62 citations
Publisher

Abstract

Single neutral atoms have been stored in a magneto-optical trap and imaged with the help of a CCD camera. The trapping of individual atoms is marked by steps in the fluorescence signal corresponding to the capture or loss of a single atom. The statistics of these capture and loss processes is explained by means of a birth-death model. The spatial distribution and the trap losses are investigated for the single-atom case and compared with the behaviour of a cloud of up to 2·10 5 atoms.

DOI
10.1209/epl/i1996-00510-7

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Single neutral atoms have been stored in a magneto-optical trap and imaged with the help of a CCD camera. The trapping of individual atoms is marked by steps in the fluorescence signal corresponding to the capture or loss of a single atom. The statistics of these capture and loss processes is explained by means of a birth-death model. The spatial distribution and the trap losses are investigated for the single-atom case and compared with the behaviour of a cloud of up to 2·10 5 atoms.
NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. Investigations of optical processes for laser cooled and trapped atoms are described. Fluorescence from Cs atoms in a magneto-optical trap is detected under conditions of very low atomic density. Discrete steps are observed in the fluorescent signal versus time and are associated with the arrival and departure of individual trapped atoms. Histograms of the frequency of occurrence of a given level of fluorescence exhibit a series of uniformly spaced peaks that are attributed to the presence of N = 0, 1, 2 atoms in the trap. In addition, numerical absorption and emission spectra for three-level [...], [...], and V systems under intense radiations are calculated. Absorption spectra for a [...] system is used to explain the probe-wave amplification and absorption spectra recorded for Cs atoms cooled and confined in a magneto-optical trap, in which novel spectral features of narrow frequency widths with single-pass gain exceeding 20% are observed. The consequence of the optical gain is demonstrated to lead to negative radiation pressure, which is investigated together with other mechanical forces in the trap. Various alternative trapping schemes in three-level and two-level atoms are proposed as possible means to compress an atomic sample and demonstrated for a two-level magneto-optical trap.
A variety of experiments are underway in the Quantum Optics Group at Caltech which investigate the quantum nature of atom-field interactions at the level of individual atoms and quanta. A recent technical advance in support of this research is the observation of cooling and trapping of single neutral cesium atoms in magneto-optical trap. Discrete steps are recorded in the fluorescence signal from the trap and are associated with the arrival and departure of individual trapped atoms. Such a spatially localized sample of a single atom with small kinetic energy is an enabling advance for diverse studies in quantum optics, including the possibility of spectroscopy with squeezed and other forms of nonclassical light and cavity quantum electrodynamics with strong coupling of an atom to the field of an optical cavity.