Quantum interference in a four-level system of a $^{87}\mathrm{Rb}$ atom: Effects of spontaneously generated coherence

TL;DR

This paper theoretically investigates quantum interference and spontaneously generated coherence in a four-level $^{87}$Rb atom system, revealing new EIT channels and controllable Kerr absorption effects.

Contribution

It introduces a novel EIT channel induced by SGC and demonstrates control over Kerr absorption in a four-level atomic system.

Findings

A new EIT channel can be induced by SGC due to destructive interference.

Kerr absorption can be coherently narrowed or eliminated.

The effects depend on the strengths of coupling and switching fields.

Abstract

In this work, the effects of quantum interference and spontaneously generated coherence (SGC) are theoretically analyzed in a four level system of a $^{87}\mathrm{Rb}$ atom. For the effects of SGC, we find that a new kind of EIT channel can be induced due to destructive interference, and the nonlinear Kerr absorption can be coherently narrowed or eliminated under different strengths of the coupling and switching fields.