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DY: Dynamik und Statistische Physik

DY 50: Entanglement and Decoherence

DY 50.6: Talk

Friday, March 12, 2004, 11:45–12:00, H2

Statistical Relaxation Behaviour in closed Quantum Systems — •Jochen Gemmer — Institut für Theoretische Physik I, Universität Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart

It is known that quantum systems like atoms, spins etc. tend to decay from exited states to their ground states in a purely statistical manner, i.e. by an exponential decay process. This behaviour is explained by famous concepts like Fermi’s Golden Rule, Weisskopf-Wigner Theory or Quantum-Masterequations. All those concepts, however, rely on additional assumptions or infinitely large environments.

We present a model of a spin coupled to a finite environment, in which the spin shows a statistical relaxation behaviour, while the dynamics of the full system are treated strictly according to the Schrödinger equation.