Driven Tunneling Dynamics: Bloch-Redfield Theory versus Path Integral Approach
Statistical Mechanics
2009-10-31 v2
Abstract
In the regime of weak bath coupling and low temperature we demonstrate numerically for the spin-boson dynamics the equivalence between two widely used but seemingly different roads of approximation, namely the path integral approach and the Bloch-Redfield theory. The excellent agreement between these two methods is corroborated by a novel efficient analytical high-frequency approach: it well approximates the decay of quantum coherence via a series of damped coherent oscillations. Moreover, a suitably tuned control field can selectively enhance or suppress quantum coherence.
Cite
@article{arxiv.cond-mat/9910359,
title = {Driven Tunneling Dynamics: Bloch-Redfield Theory versus Path Integral Approach},
author = {Ludwig Hartmann and Igor Goychuk and Milena Grifoni and Peter Hanggi},
journal= {arXiv preprint arXiv:cond-mat/9910359},
year = {2009}
}
Comments
4 pages including 3 figures, submitted for publication