EPL, 86 (2009) 54003
DOI: 10.1209/0295-5075/86/54003

The generalized analytical approximation to the solution of the single-mode spin-boson model without rotating-wave approximation

T. Liu^{1, 2}, K. L. Wang³ and M. Feng<sup>1

1</sup>   State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences - Wuhan, 430071, China
²   The School of Science, Southwest University of Science and Technology - Mianyang 621010, China
³   The Department of Modern Physics, University of Science and Technology of China - Hefei 230026, China

mangfeng@wipm.ac.cn

received 19 February 2009; accepted in final form 22 May 2009; published June 2009
published online 19 June 2009

Abstract
The single-mode spin-boson model (SMSBM) has extensive application in different subfields of physics. In the absence of rotating-wave approximation (RWA), we try to solve the SMSBM analytically. We argue that the analytical expression obtained might be the most exact approximation to the solution of the system in our case under the assumption of the Abel-Ruffini theorem, which works for a wide range of the parameters such as coupling strength and detuning and would be practical for currently available experiments.

PACS
42.50.-p - Quantum optics.
03.65.Ge - Solutions of wave equations: bound states.

© EPLA 2009