摘要
We study the stability of decoherence-free subspaces under stochastic phase fluctuations by analytically and numerically evaluating the fidelity of the corresponding decoherence-free subspace bases with stochastic phase fluctuations under the evolution of environment. The environment is modeled by a bath of oscillators with infinite degrees of freedom and the register-bath coupling is chosen to be a general dissipation-decoherence form. It is found that the decoherence-free subspaces take on good stability in the case of small dissipation and small phase fluctuations.
基金
The project supported by the National Fundamental Research Program of China under Grant No. 2001CB309310, National Natural Science Foundation of China under Grant Nos. 10347128, 10325523, and 90203018, the Natural Science Foundation of Hunan Province of China under Grant No. 04JJ3017, the China Postdoctoral Science Foundation under Grant No. 2005037695, and the Scientific Research Fund of Educational Bureau of Hunan Province of China under Grant No. 05B041
