© William P. Reinhardt.
On the left, we see the oscillations of a pure BEC that has been disturbed somehow. Under ideal conditions, this initially displaced pure BEC will continue to oscillate forever at a temperature of 0 K. The period of these oscillations is determined by the mass of the atoms and the shape of the trap. On the right, we see the effect of slowly adding heat to the condensate over time. As time passes and the temperature increases, the once clear and strongly regular oscillations begin to be quenched, and atoms are lost from the central and still quantum-like core. The main mechanism causing such behavior is decoherence of the overall quantum phase of the condensate. (Unit: 6)