Regensburg 2004 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 29: Quantenkoh
ärenz und Quanteninformationssysteme II

TT 29.11: Vortrag

Donnerstag, 11. März 2004, 17:15–17:30, H19

Bath assisted adiabatic following — •Christos Kostoglou, Mathias Michel, and Günter Mahler — Institut für Theoretische Physik 1, Universität Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart

We regard quantum systems for which adiabatic following is No-dqnot genericNo-dq, i.e. not only the eigenvalues but also the eigenstates of the Hamiltonian are time dependent. A simple, pertinent model is a spin-1/2-system in a rotating magnetic field, the adiabatic following of which fades away with increasing rotation frequency. Here we test if the dephasing influence of a microcanonically coupled environment supports adiabatic following. The environment is modeled as a n-level system randomly coupled to the spin without allowing for energy exchange. The environment can be interpreted as an ubiquitous container of thermodynamic machines; such a combination of spin-1/2-system and container leads us to an analog to thermodynamic processes on quantum scale. Time evolution is given by the time-dependent Schrödinger equation.