Limit of Spin Squeezing in Finite Temperature Bose-Einstein Condensates

Abstract

We show that, at finite temperature, the maximum spin squeezing achievable using interactions in Bose-Einstein condensates has a finite limit when the atom number $N\to \infty$ at fixed density and interaction strength. We calculate the limit of the squeezing parameter for a spatially homogeneous system and show that it is bounded from above by the initial non-condensed fraction.

Final version in English (4 pages) and in French (5 pages)