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29 March 2024
 
  » arxiv » 1002.1573

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A single atom detector integrated on an atom chip: fabrication, characterization and application
D. Heine ; W. Rohringer ; D. Fischer ; M. Wilzbach ; T. Raub ; S. Loziczky ; XiYuan Liu ; S. Groth ; B. Hessmo ; J. Schmiedmayer ;
Date 8 Feb 2010
AbstractWe describe a robust and reliable fluorescence detector for single atoms that is fully integrated into an atom chip. The detector allows spectrally and spatially selective detection of atoms, reaching a single atom detection efficiency of 66%. It consists of a tapered lensed single-mode fiber for precise delivery of excitation light and a multi-mode fiber to collect the fluorescence. The fibers are mounted in lithographically defined holding structures on the atom chip. Neutral 87Rb atoms propagating freely in a magnetic guide are detected and the noise of their fluorescence emission is analyzed. The variance of the photon distribution allows to determine the number of detected photons / atom and from there the atom detection efficiency. The second order intensity correlation function of the fluorescence shows near-perfect photon anti-bunching and signs of damped Rabi-oscillations. With simple improvements one can boost the detection efficiency to > 95%.
Source arXiv, 1002.1573
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