Düsseldorf 2007 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 25: Quanteninformation (Verschränkung und Dekohärenz II)

Q 25.7: Talk

Tuesday, March 20, 2007, 15:45–16:00, 5L

Decoherence in dynamical quantum phase transition — •Sarah Mostame and Ralf Schuetzhold — Institut fuer Theoretische Physik, Technische Universitaet Dresden, 01062 Dresden

The quantum Ising model is one of the basic models for the understanding of quantum phase transitions. Ground state entanglement, which is responsible for long-range correlations in quantum phase transitions, is also a key factor for this quantum phenomenon. We study the dynamics of a quantum phase transition in the quantum Ising model weakly coupled to a general bath. Under the assumption of fully adiabatic evolution our results show that the first order corrections due to decoherence increase linearly with the system size.