Decoherence induced by a phase-damping reservoir

Renato M. Angelo, E. S. Cardoso, K. Furuya
2006 Physical Review A. Atomic, Molecular, and Optical Physics  
A phase damping reservoir composed by $N$-bosons coupled to a system of interest through a cross-Kerr interaction is proposed and its effects on quantum superpo sitions are investigated. By means of analytical calculations we show that: i-) the reservoir induces a Gaussian decay of quantum coherences, and ii-) the inher ent incommensurate character of the spectral distribution yields irreversibility . A state-independent decoherence time and a master equation are both derived an alytically.
more » ... an alytically. These results, which have been extended for the thermodynamic limit, show that nondissipative decoherence can be suitably contemplated within the EI D approach. Finally, it is shown that the same mechanism yielding decoherence ar e also responsible for inducing dynamical disentanglement.
doi:10.1103/physreva.73.062107 fatcat:rk5hftg6sreobnfc3m4git2mbm