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Electric Quantum Walks (Journal club)

Róbert Juhász

(MTA Wigner RCP SZFI)

Time: Tue Nov 26 13:00:00 2013
Location: Building 1, Room 114, Auditorium

In discrete time quantum walks the effect of the electronic field can be described by multiplication with a position dependent phase factor. The recorded dynamics of such a quantum particle exhibits features closely related to Bloch oscillations and interband tunneling. In particular, we explore the regime of strong fields, demonstrating contrasting quantum behaviors: quantum resonances vs dynamical localization depending on whether the accumulated Bloch phase is a rational or irrational fraction of 2π.

References:

C. Cedzich, T. Rybár, A. H. Werner, A. Alberti, M. Genske, and R. F. Werner, Propagation and spectral properties of quantum walks in electric fields, Phys. Rev. Lett. 111, 160601 (2013) [arXiv]
M. Genske, W. Alt, A. Steffen, A. H. Werner, R. F. Werner, D. Meschede, and A. Alberti, Electric quantum walks with individual atoms, Phys. Rev. Lett. 110, 190601 (2013) [arXiv]