2021/05/07 by P. Nalbach, Nalbach, Peter
Computer Science · Physics and Astronomy · #FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Quantum Information and Cryptography #Quantum Physics (quant-ph) #Quantum optics and atomic interactions #Spectroscopy and Quantum Chemical Studies
paper · pdf · doi:10.48550/arxiv.2105.03526
openalex publication_date 2021/05/07 · openalex created_date 2022/07/25 · openalex updated_date 2026/07/28
We study the dynamics of a quantum two state system driven through an avoided\ncrossing under the influence of a super Ohmic environment, i.e. a longitudinal\nas well as a transversal one. The crossing time window, in which relaxation\ninfluences the dynamics, is centered around the avoided crossing. We determine\nthe dynamics and the Landau-Zener probability employing the numerical exact\nquasi-adiabatic path integral. At weak coupling we show that the numerically\nless demanding nonequilibrium Bloch equations provide an accurate description.\nThe crossing time depends strongly not only on the system-bath coupling\nstrength but also on the bath spectral cut-off frequency in contrast to the\nsituation in an Ohmic bath. Our results enable to design quantitative protocols\nwhich drive quantum systems out of the influence range of relaxation.\n