title: Non-Markovianity: initial correlations and nonlinear optical measurements.
abstract: By extending the response function approach developed in nonlinear optics, we analytically derive an expression for the non-Markovianity in the time evolution of a system in contact with a quantum mechanical bath, and find a close connection with the directly observable nonlinear optical response. The result indicates that memory in the bath-induced fluctuations rather than in the dissipation causes non-Markovianity. Initial correlations between states of the system and the bath are shown to be essential for a correct understanding of the non-Markovianity. These correlations are included in our treatment through a preparation function.
authors: Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.
authors: Arend G
authors: AG
authors: Dijkstra
authors: Yoshitaka
authors: Y
authors: Tanimura
mesh_terms: D003198:Computer Simulation; D008027:Light; D008390:Markov Chains; D008962:Models, Theoretical; D017711:Nonlinear Dynamics; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation; D013816:Thermodynamics