Quantum-trajectory approach to stochastically induced quantum-interference effects in coherently driven two-level atoms

Competitive stochastic noises in coherently driven two-level atoms and quantum interference

“…In the case of large phase noise, there is no dip in the spectrum. Therefore one expects that phase noise demolishes the quantum interference induced by collisions which is, according to reference [20], the reason behind the appearance of the dip. Our intention is to examine how robust this interference, introduced in fact by a separate noise process, is against the competing phase noise.…”

“…An analysis based on quantum-trajectory method was presented for the phase noise free case in reference [20]. A similar analysis will be carried out here: the quantumtrajectory method of reference [24] will be applied for simulating the time evolution of the system in argument, and phase noise will also be taken into account.…”

“…Increasing collision rate in the absence of phase noise, the Mollow triplet turns into a doublet structure. In the high collision rate limit one obtains a spectrum with a narrow dip at zero frequency that has its origin in quantum interference [20,27].…”

“…The phase difference can be calculated straightforwardly from a single quantumtrajectory. It was shown in reference [20], that in the lack of phase noise, the collisional noise can unexpectedly create phase correlation between the neighboring atomic dressed states. This is the underlying physical process that makes the quantum interference possible, which leads to a narrow dip in the spectrum.…”

“…Under special circumstances, however, even the incoherent perturbation can be responsible for the quantum interference [17,18,19]. In a recent paper [20], a system of twolevel atoms strongly driven by a coherent light field and perturbed by collisional noise was analyzed by the quantum-trajectory method [21,22,23,24,25,26]. It was shown that collisional noise can unexpectedly create phase correlation between the neighboring atomic dressed states.…”