Xiang-an Yan

TL;DR: In this article, a scheme for giant enhancement of the Kerr nonlinearity in a four-level atomic system in which spontaneously generated coherence is present is proposed, which is mainly based on the presence of an extra atomic coherence induced by the spontaneously generated CO. Numerical values obtained by solving the density matrix equations agree well with these exact analytical values.

TL;DR: In this paper, the effect of spontaneous generated coherence (SGC) on Kerr nonlinearity of a four-level N-type system was investigated, and it was found that the enhancement of Kerr non-linearity was mainly due to the generation of extra coherences induced by the superposition of the two SGC channels.

TL;DR: In this paper, the interaction of three laser fields with a four-level quantum system in a tripod configuration was analyzed and an analytical expression for the linear susceptibility and nonlinear susceptibility of a weak-probe field was obtained.

TL;DR: In this article, a scheme for achieving giant enhancement of the self-Kerr nonlinearity in a four-level Y-type atom with two highest nearly degenerate lying levels was proposed.

TL;DR: In this paper , the authors present a theoretical treatment for the complete dynamics process of three-photon electromagnetically induced absorption (TPEIA), where two counter-propagating coupling fields are tuned to the upper line in a closed-cycle ladder-type three-level atomic system.