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TT: Fachverband Tiefe Temperaturen

TT 27: CE: Poster Session

TT 27.63: Poster

Mittwoch, 24. März 2010, 14:00–18:00, Poster D1

Coupled qubits in a dissipative environment — •Etienne Gärtner and Ralf Bulla — Institute of Theoretical Physics, University of Cologne, Germany

In recent years Numerical Renormalization Group (NRG) methods have not only been applied to systems of pure fermionic degrees of freedom. The successful application of NRG-techniques to the spin boson model has led to important insights on several technicalities one has to handle e.g. when dealing with a bosonic Hilbertspace and its unavoidable truncation. In the present case we study a system of two coupled qubits interacting with a dissipative environment. The dissipation is mediated through a bath of harmonic oscillators, thus we use a two-spin boson model to describe the system. In case of ohmic damping we calculate the entropy in a wide range of the parameter space to extract information about the ground state and the phase diagram.