Short-Time Effects of Environment to Josephson Charge Qubit: A Master Equation Approach
Zhiqiang Li, Xian-Ting Liang · Communications in Theoretical Physics · 2008
In this paper we investigate an environmental effects to Josephson charge qubit (JCQ) when the environment is taken as the Ohmic bath. At first, we derive the master equation from a JCQ-bath model. Then we investigate the coefficients of the equations that describe the shift in frequency, diffusive, decoherence, and so on. It is shown that our result on decoherence agrees with experimental one very well as the time is short enough.