An exact steady-state density operator is obtained for a model describing the collective behaviour of a system of N two-level atoms. The model yields a Fokker-Planck equation which does not satisfy detailed balance. The density operator is further employed to obtain exact analytical expressions...

Exact analytic results for the steady-state atomic correlation functions of arbitrary order n are given for a system of N superimposed two-level atoms (the Dicke model) collectively interacting with an imposed C.W. laser field. Photon statistical studies through the normalised...

We derive a master equation for the ensemble averaged atomic density operator for a system of N identical superimposed two-level atoms (the Dicke model) driven by an intense, fluctuating laser field of finite phase/amplitude bandwidth by using the theory of multiplicative stochastic processes....

A system of N identical two-level atoms occupying the same site (Dicke model) driven by a coherent field is considered. From the known exact steady state atomic density operator, exact closed form expressions for the atomic observables, their fluctuations and correlation functions are...

A theoretical analysis of the fundamental problem of two-level atomic systems radiatively decaying and coupled to Fock state radiation fields is presented. First, for a broad-band Fock state field and for a single two-level atom the Einstein radiation rate equation is derived within a scheme of...

A system of N identical two-level atoms occupying the same site (the Dicke model) interacting with one another and driven by a coherent field is considered. From the known exact steady-state atomic density operator, expressions for the atomic observables, their fluctuations and correlation...