Atom counting in ultra-cold gases using photoionisation and ion detection
T. Campey, C. J. Vale, M. J. Davis, S. Kraft, C. Zimmermann, J. Fortágh, N. R. Heckenberg, H. Rubinsztein-Dunlop
Abstract
We analyse photoionisation and ion detection as a means of accurately counting ultra-cold atoms. We show that it is possible to count clouds containing many thousands of atoms with accuracies better than N-1/2 with current technology. This allows the direct probing of sub-Poissonian number statistics of atomic samples. The scheme can also be used for efficient single atom detection with high spatio-temporal resolution. All aspects of a realistic detection scheme are considered, and we discuss experimental situations in which such a scheme could be implemented.
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