The Mystery of the Ramsey Fringe that Didn't Chirp

Details The Mystery of the Ramsey Fringe that Didn't Chirp The Mystery of the Ramsey Fringe that Didn't Chirp

2002-09-10

arxiv.org/abs/cond-mat/0209249v1

Physics

Condensed Matter

Soft Condensed Matter

Proceedings of the 18th International Conference on Atomic Physics (ICAP 2002)

Scientific paper

We use precision microwave spectroscopy of magnetically trapped, ultra-cold 87Rb to characterize intra- and inter-state density correlations. The cold collision shifts for both normal and condensed clouds are measured. The results verify the presence of the sometimes controversial "factors of two", in normal-cloud mean-field energies, both within a particular state and between two distinct spin species. One might expect that as two spin species decohere, the inter-state factor of two would revert to unity, but the associated frequency chirp one naively expects from such a trend is not observed in our data.

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