Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 99: Poster Session: Transport

TT 99.53: Poster

Donnerstag, 15. März 2018, 15:00–19:00, Poster B

Decoherence dynamics of the quantum Ising model in the strong coupling regime — •Hannes Weisbrich, Wolfgang Belzig, and Gianluca Rastelli — Fachbereich Physik, Universität Konstanz, D-78457 Konstanz, Germany

We study the decoherence dynamics of the 1D quantum Ising model within the framework of the Lindblad equation. We consider spins forming a 1D ring lattice uniformly coupled to a single bath via the spin component parallel to a transverse magnetic field. The system is analysed in the strong coupling regime in which the interaction strength is much larger than the transversal field, such that the spin chain has two degenerate ground states. We will focus on the dynamics between the ground states and the lowest excited states of the system. We find a decoherence free subspace as long as the dissipative coupling is parallel to the transverse magnetic field. Finally, we show that even if a more realistic model of non-uniform dissipative interaction is assumed, i.e. the local dissipation is uncorrelated with the rest of the ring, the decoherence free subspace is preserved due to parity conservation.