Regensburg 2010 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 18: TR: Quantum Coherence and Quantum Information Systems 1

TT 18.8: Talk

Tuesday, March 23, 2010, 16:00–16:15, H21

Spectroscopy of a Periodically Driven Qubit Coupled to a Non-Gaussian Bath — •Cheng Guo, Florian Marquardt, and Jan von Delft — Physics Department, Arnold Sommerfeld Center for Theoretical Physics, and Center for NanoScience, Ludwig-Maximilians-Universität München, D-80333 München, Germany

The dynamics and decoherence of solid-state qubits are often determined by a few non-Gaussian fluctuators. Paradigmatic models often used to represent the qubit-environment system like the spin-boson model cannot be applied here because they describe Gaussian-distributed fluctuations. The simplest model for non-Gaussian quantum noise is the so-called "quantum telegraph noise" model. It involves a qubit subject to the charge fluctuations of a single electron level that is tunnel-coupled to a reservoir. We use the adaptive time-dependent density-matrix renormalization group method (tDMRG) to study the dynamics of this model with arbitrary time-dependence. In particular, we present tDMRG-results on spectroscopy of the qubit under periodic driving.