DECOHERENCE OF QUANTUM BIT IN THE WEAK-COUPLING LIMIT
Yan Chen · Journal of Yangzhou University · 2003
The decoherence of the quantum bit is studied in the approximation of weak coupling in the Liouville space. The dynamic equation of N quantum bits is given in the weakly coupling limits and under the non-Markovian approximation. The rate of decoherence is given in the approximation of different time order. Based on the above results, the general form of criterion for decoherence-free states is proposed. Also a new method for quantum correction is proposed from the non-Markovian dynamic equation in the weak coupling limit.