Coherence effects in a finite temperature Bose-Einstein condensate

Heather Lewandowski,
NIST/JILA, University of Colorado

Abstract: Understanding the effects created by the loss of coherence in Bose-condensed systems is critical if condensates are to be used in applications such as quantum information or precision measurement. In quantum information systems, the loss of coherence limits the duration of an experiment, and thus the complexity of the computation. The loss of coherence will also limit the precision of spectroscopic measurements of small energy shifts (e.g., caused by Casimir and hypothetical short-range forces). We investigate the relationship between the coherence of a partially Bose-condensed spinor gas and its temperature. We observe cooling of the normal component driven by decoherence as well the effect of temperature on decoherence rates.