Squeezing in a dipolar Bose—Einstein condensed gas

Abstract

We consider a gaseous atomic Bose—Einstein condensate with dipole—dipole interactions induced by a far off-resonance laser. The long-range dipolar interactions introduce atom—atom correlations on the new scale of the laser wavelength, giving a controllable method of squeezing low energy modes. At high enough laser intensities the correlations lead to a roton minimum in the excitation spectrum.