Limit to non-destructive optical detection of atoms

Details Limit to non-destructive optical detection of atoms Limit to non-destructive optical detection of atoms

2003-08-28

arxiv.org/abs/quant-ph/0308153v1

Physics

Quantum Physics

4 pages, 1 figure

Scientific paper

10.1103/PhysRevLett.93.180402

All optical techniques used to probe the properties of Bose-Einstein condensates have been based on dispersion and absorption that can be described by a two-level atom. Both phenomena lead to spontaneous emission that is destructive. Recently, both were shown to lead to the same limit to the signal to noise ratio for a given destruction. We generalise this result to show that no single-pass optical technique using classical light, based on any number of lasers or coherences between any number of levels, can exceed the limit imposed by the two-level atom. This puts significant restrictions on potential non-destructive measurement schemes.

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