Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 11: Transport: Quantum Coherence and Quantum Information Systems 2 (jointly with MA and HL)

TT 11.4: Talk

Monday, March 26, 2012, 15:45–16:00, BH 243

Non-equilibrium dynamics of the central spin model — •Alexandre Faribault and Dirk Schuricht — Institute for Theory of Statistical Physics RWTH Aachen Physikzentrum Sommerfeldstrasse 52074 Aachen Germany

A long standing proposal for a q-bit is to use the spin of a single electron trapped in a quantum dot. In such solid-state based systems, the dominant decoherence mechanism is the hyperfine coupling of the electron spin to the nuclear spins in the substrate. In this work, the Central spin model describing such a quantum system is studied numerically by exploiting its quantum integrability via the algebraic Bethe ansatz. In doing so, it becomes possible to efficiently compute exact eigenstates which we then use to study non-equilibrium dynamics in scenarios describing the relaxation and decoherence of prepared states.