Physics – Condensed Matter – Quantum Gases
Scientific paper
2010-02-08
New J. Phys. 12, 095005 (2010)
Physics
Condensed Matter
Quantum Gases
24 pages, 11 figures
Scientific paper
We 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%.
Fischer Debra
Groth Sönke
Heine Dennis
Hessmo Björn
Liu Xiyuan
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