Regensburg 2007 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 3: Quantum Coherence and Quantum Information Systems I
TT 3.6: Talk
Monday, March 26, 2007, 11:00–11:15, H20
Quantum state preparation via Landau-Zener tunneling — •Sigmund Kohler1, Martijn Wubs1, Peter Hänggi1, Keiji Saito2, and Yosuke Kayanuma3 — 1Institut für Physik, Universität Augsburg — 2University of Tokyo, Japan — 3Osaka Prefecture University, Japan
The coupling of a qubit to a circuit-QED mode can induce Landau-Zener transitions of the qubit upon switching the magnetic flux that penetrates the superconducting loop. The adiabatic energies of this system are characterized by multiple exact and avoided level crossings, so that the usual two-level Landau-Zener formula is no longer applicable. We derive selection rules for the multi-level transitions and present an exact expression for the corresponding transition probabilities. Applications include quantum state preparations like single-photon generation and the controllable creation of qubit-oscillator entanglement.
[1] K. Saito, M. Wubs, S. Kohler, P. Hänggi, and Y. Kayanuma, Europhys. Lett. 76, 22, (2006).