@Article{CiCP-7-718,
author = {Zhuo Wang, Quanlin Jie and Shi-Hui Zhang},
title = {Simulation of Decoherence by Averaged Semiquantum Method},
journal = {Communications in Computational Physics},
year = {2010},
volume = {7},
number = {4},
pages = {718--737},
abstract = {<p style="text-align: justify;">We investigate the dynamics of a system coupled to an environment by averaged
semiquantum method. The theory origins from the time-dependent variational
principle (TDVP) formulation and contains nondiagonal matrix elements, thus it can
be applied to study dissipation, measurement and decoherence problems in the model.
In the calculation, the influence of the environment governed by differential dynamical
equation is incorporated using a mean field. We have performed averaged semiquantum
method for a spin-boson model, which reproduces the results from stochastic
Schrodinger equation method and Hierarchical approach quite accurately. Moreover,
we validate our results with noninteracting-blip approximation (NIBA) and generalized
Smoluchowski equation (GSE). The problem dynamics in nonequilibrium environments
has also been studied by our method. When applied to the harmonic oscillator
model coupled to a heat bath with different coupling strengths and dimensionalities
of the bath, we find that the loss of coherence predicted by semiquantum method
is identical to the result of master equation with different initial state (Gaussian wave
packet and superposed wave packets).</p>},
issn = {1991-7120},
doi = {https://doi.org/10.4208/cicp.2009.09.044},
url = {http://global-sci.org/intro/article_detail/cicp/7651.html}
}