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Lecture Martijn Wubs


27 February 2006 FWN-Building 5116.0136, Nijenborgh 4, 9747 AG, Groningen
Speaker:Dr. Martijn Wubs
Affiliation:Physics Department, University of Augsburg
Title:Landau-Zener transitions in qubit-oscillator systems
Date:Mon Feb 27, 2006
Location:FWN-Building 5116.0136
Host:J. Knoester
Telephone:+31 50 363 4369


In recent experiments, it was shown that superconducting circuits can behave as the electronic analogy of cavity quantum electrodynamics: an effective two-level atom (qubit) interacts with a quantum harmonic oscillator. This theoretical talk is about what happens when we let the qubit undergo a Landau-Zener transition by forcing its energy levels to cross. It will be shown what type of qubit-oscillator entanglement arises. Furthermore, the effect of the oscillator on the tunnelling probability for the qubit is studied. Different types of interaction lead to quite different results. Some exact tunneling probabilities are presented, also for the case in which the qubit is coupled to several oscillators or even a continuum of them.
Last modified:22 October 2012 2.30 p.m.