Quantum interference effect in molecular system

Paul W. Brumer, Moshe Shapiro

Anu Venugopalan

Wang Zhu-geng

Recent investigations on quantum interference effects were introduced, including line-shape variation, spontaneous emission enhancement or cancellation, constructive interference and electromagnetically induced transparency in molecular and atomic-molecular mixed systems in our laboratory. It is instructive to the researches about quantum interference and control in molecular, condensed matter and material systems.

Z. Ficek

In this review the author discusses the major effects resulting from the modification of spontaneous emission by quantum interference. He begins in Section II by presenting elementary concepts and definitions of the first- and second-order correlation functions, which are frequently used in the analysis of the interference phenomena. Section III describes the master equation approach used for analyzing quantum interference effects in atomic and molecular systems. In Sections IV and V the author reviews the fundamental quentum interference effects in spontaneous emission and in coherently driven systems. He discusses different schemes for suppression of spontaneous emission and population trapping and gives an alternative explanation of these effects in the dressed-atom picture. Section VI deals with the problem of amplification on dark transitions, which are important for information processing without spontaneous emission. The effect of quantum interference on photon correlations is discussed in Section VII. Multilevel systems composed of two transitions with parallel dipole moments and methods for generating two transitions with nonorthogonal dipole moments are briefly discussed in Section VIII. The final section (Section IX) deals with the experimental demonstration of constructive and desctructive interference effects in a driven molecular system.

Wang Li

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.

A. A. Villaeys, Karl F. Freed