We consider two two-level atoms fixed at different positions, driven by a resonant monochromatic laser field, and interacting collectively with all the modes of the quantum electromagnetic field. A Born-Markov-secular master equation is used to describe the dynamics of the two atoms. When the atoms have the same coupling with the laser field, it is shown that their steady-state density operator is approximately an
X state and this is used to obtain simple approximate analytic expressions for steady-state quantum and classical correlations which are characterized as functions of the laser field intensity and the distance between the two atoms. Moreover, the values of both the laser field intensity and the distance between the two atoms that maximize correlations are identified.
We consider a coupled quantum system, where two identical one-atom lasers interface with each other via the light-induced long-range dipolar interaction between two laser-active atoms. We theoretically investigate the effects of the interatomic interaction on the lasing dynamics from three experimentally measurable aspects, including the light intensity, the first-order correlation of the laser field, and the intensity–intensity correlation. We find that the long-range interatomic coupling leads to the high intercoherence between two laser fields. Finally, we discuss the experimental feasibility of this coupled system.