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We investigate the effects of the initial correlation on the dynamics of opensystem in the exactly solvable pure dephasing model. We show that the role ofthe initial correlation come into play through a phase function and a weightfactor, which would perform oscillations during time evolution, and find thatthe decoherence of a qubit coupled to a boson bath is more enhanced withrespect to a spin bath in the short time. We also demonstrate that the tracedistance between two states of a qubit can increase above its initial value,and that the initial correlation can provide another resource for the damplyoscillation and revival of the entanglement of two qubits. We finallyinvestigate the dependence of the crossover of decoherence from the dynamicalenhancement to suppression under the bang-bang pulse control on the initialcorrelation and the statistics of the bath constituents.

the european physical journal. d, atomic, molecular and optical physics/the european physical journal. d, atomic, molecular, optical and plasma physics

The dynamical role of initial correlation in the exactly solvable dephasing model