Heidelberg 2015 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 31: Poster: Quantum Optics and Photonics II

Q 31.49: Poster

Tuesday, March 24, 2015, 17:00–19:00, C/Foyer

Detours to Diabaticity — •Tobias Chasseur¹, Lukas Theis¹, Yuval Sanders², Daniel Egger¹, and Frank Wilhelm^1,2 — ¹Universität des Saarlandes, Saarbrücken, Germany — ²IQC and Dept. of Physics and Astronomy, University of Waterloo, 200 University Ave. W, Waterloo, ON, N2L 3G1, Canada

For a finite-velocity linear sweep through an avoided crossing, Landau-Zener theory predicts a not vanishing transition probability between the basis states. However due to spurious couplings in frequency tuned quantum bits one would like to suppress such transitions.

This poster presents a way to keep a Landau-Zener(LZ) crossing fully diabatic at finite crossing velocity based on an ansatz of an oscillation augmented sweep. Several pulse shapes will be explained by a model of separated photon-assisted linear LZ-transitions as well as through numerical methods of optimal control. Furthermore there is a discussion of their mutual advantages and an examination of robustness.