Trapped individual ion at absolute zero temperature

Trapped individual ion at absolute zero temperature.

Laser cooling and ion trapping have progressed to such an extent that one can now speak of realizing a confined atom at absolute zero temperature. In this short publication, we analyze an experiment toward such realization using a single Ba(+) ion in a miniature rf trap. The Ba(+) ion is first laser-cooled to the limit where the ion spends most of its time in the zero-point energy state. Then a...

Ion temperature gradient driven turbulence with strong trapped ion resonance

Decoherence at zero temperature

Most discussions of decoherence in the literature consider the high temperature regime but it is also known that, in the presence of dissipation, decoherence can occur even at zero temperature. Whereas most previous investigations all assumed initial decoupling of the quantum system and bath, we consider that the system and environment are entangled at all times. Here, we discuss decoherence fo...

Zero temperature correlations in trapped Bose-Einstein condensates

We introduce a family of correlated trial wave functions for the N -particle ground state of an interacting Bose gas in a harmonic trap. For large N , the correlations lead to a relative energy decrease of a fraction 3 5N , compared to mean field Gross-Pitaevskii theory. The kinetic energy in the weakly confining direction turns out to be most sensitive to our correlations and, remarkably, is h...

Notes on decoherence at absolute zero

The problem of electron decoherence at low-temperature is analyzed from the perspective of recent experiments on decoherence rate measurement and on related localization phenomena in low-dimensional systems. The importance of decoherence at zero temperature, perhaps induced by quantum #uctuations, is put in a broader context. ( 2000 Elsevier Science B.V. All rights reserved.