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Quantum interference of quasi-∧-type four-level system

Wang Li

Published Jan 1, 2002• 0 citations
OpenAlex

Abstract

The quantum interference effect of the quasi-∧-type four-level system, which is formed with the interaction between atoms and molecular, is investigated. The mechanism of quantum interference is analyzed which exists in the system of sodium atoms and argon gas incited by laser. The co-area existing in decoration-state is first presented and quantum interference enhancement in the area of atom spectrum is interpreted according to the computational result.

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The quantum interference effect of the quasi-∧-type four-level system, which is formed with the interaction between atoms and molecular, is investigated. The mechanism of quantum interference is analyzed which exists in the system of sodium atoms and argon gas incited by laser. The co-area existing in decoration-state is first presented and quantum interference enhancement in the area of atom spectrum is interpreted according to the computational result.
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We report an experimental demonstration of photon switching by quantum interference in a four-level atomic system proposed by Harris and Yamamoto [Phys. Rev. Lett. 81, 3611 (1998)]. Quantum interference inhibits single-photon absorption but enhances third-order, two-photon-type absorption in the four-level system. We have observed greatly enhanced nonlinear absorption in the four-level system realized with cold 87Rb{}^{87}\mathrm{Rb}87Rb atoms and demonstrated fast switching of the nonlinear absorption with a pulsed pump laser.
In this work, the effects of quantum interference and spontaneously generated coherence (SGC) are theoretically analyzed in a four-level system of a 87Rb^{87}\mathrm{Rb}87Rb atom. For the effects of SGC, we find that a new kind of electromagnetically induced transparency 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.