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In this work, the effects of quantum interference and spontaneously generatedcoherence (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 EITchannel can be induced due to destructive interference, and the nonlinear Kerrabsorption can be coherently narrowed or eliminated under different strengthsof the coupling and switching fields.

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