Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 58: Transport: Poster Session

TT 58.25: Poster

Mittwoch, 9. März 2016, 15:00–18:30, Poster D

Decoherence dynamics in a finite-size quantum Ising model. — •Cyril Saussol, Wolfgang Belzig, and Gianluca Rastelli — University of Konstanz Fachbereich Physik D-78457, Konstanz, Germany.

We study the non-equilibrium dynamics of a quantum Ising chain with N spins coupled to a bath. We consider as initial state an entangled state formed by two many-spin classical states. In the limit in which the transversal magnetic field (TMF) vanishes, the system contains a decoherence-free subspace (DFS). Moreover, this model has also an exact solution. Hence we tackle the problem by using a perturbative approach in the TMF to study the decoherence dynamics. In particular, we are interested to calculate analytically the decoherence time if the system is initialized in an entangled state of the DFS. Finally, we discuss the perspectives of how to prepare optimal, initial entangled states (formed by more than two classical states) in order to increase the decoherence time.