Theoretical Study of Quantum Dissipation and Laser Noise Effects on the Atomic Response.pdf

THEORETICAL STUDY OF QUANTUM DISSIPATION AND LASER NOISE EFFECTS ON THE ATOMIC RESPONSE * ♣ ♣ ♣ ♣ O. El Akramine , A. Makhoute , M. Zitane and M. Tij ♣ UFR Physique Atomique, Moléculaire Optique Appliquée Université Moulay Ismail, Faculté des Sciences, B.P. 4010 Beni M’hamed, Meknès, Morocco. * Physique Atomique Théorique, Faculté des Sciences, Université Libre de Bruxelles, CP 227, Brussels, Belgium. Short title: Theoretical study of quantum dissipation and Laser noise effects PACS index number(s): 42.50.Lc, 42.50.Ct Submitted to: Phys. Rev A. Date: 14 September 1998 Abstract The nonlinear dynamics of dissipative quantum systems in incoherent laser fields is studied in the framework of master equation with random telegraph model describing the laser noise and Markovian approximation for dealing with the system-bath couplings. Floquet theory and time-dependent perturbation methods are used to facilitate both analytical and numerical solutions. We develop a theoretical formalism that provides a powerful tool for the detailed analysis of the dissipative quantum dynamics of multilevel systems driven by intense stochastic laser fields. It is found that the system relaxes to a steady state by the effect of laser phase and frequency noises and the kinetic of this relaxation increases with the addition of dissipative terms, introduced by the coupling to the reservoir. The case of amplitude fluctuations shows a different behavior. Other results concerning the destruction of quantum coherence and the dynamical localization will be established and further relaxa