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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Effects of atomic cooperation and dipole correlation on the N-photon emission spectrum of atoms

Zhenfei Luo, Zhizhan Xu

Published Oct 28, 1992• 0 citations
Publisher

Abstract

Two new results are revealed. First, in the strong-field region of cavity-mode the two-atom emission spectrum shows four peaks for N > 1 (vs. three for N equals 1). The distance between the two inner peaks is twice as large as the corresponding one in the one-atom spectrum due to atomic cooperation. Second, the inclusion of atomic dipole-dipole interaction makes the emission spectrum asymmetric; this effect is most obvious in the vacuum field.

DOI
10.1117/12.130464

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Two new results are revealed. First, in the strong-field region of cavity-mode the two-atom emission spectrum shows four peaks for N > 1 (vs. three for N equals 1). The distance between the two inner peaks is twice as large as the corresponding one in the one-atom spectrum due to atomic cooperation. Second, the inclusion of atomic dipole-dipole interaction makes the emission spectrum asymmetric; this effect is most obvious in the vacuum field.
We investigate effects that the presence of a second atom has on the dynamic characteristics of a field and an atom in a single-mode cavity, with particular reference to the nonclassical features of the atom–field interaction. The field statistics are marginally altered, but the field and the atomic dipole squeezing are significantly altered. The vacuum-field Rabi splitting, which produces only two peaks in the emission spectrum of an isolated atom, gives a far more complex spectrum when another atom is present in the cavity.
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This article investigates the interaction of a pair of two-level atoms with a quantized radiation field in an ideal cavity, taking into account the dipole-dipole interaction between the two atoms. One-photon and two-photon transitions are treated. It is found that the spectra have eight completely asymmetric peaks in both cases. For an intense field in both processes, a striking feature with five asymmetrically distributed peaks is recorded if ga γ where ga is the dipole-dipole coupling constant and γ is the detector's width. If the atoms' coupling is weak and the spectrometer's resolution is low, say ga < γ, then only a three-peak structure can be obtained.
We investigate the effect of the dipole–dipole interaction (DDI) on the photon statistics with two atoms trapped in an optical cavity driven by a laser field and subjected to cooperative emission. By means of the quantum trajectory analysis and the second-order correlation functions, we show that the photon statistics of the cavity transmission can be flexibly modulated by the DDI while the incoming coherent laser selectively excites the atom–cavity system’s nonlinear Jaynes–Cummings ladder of excited states. Finally, we find that the effect of the cooperatively atomic emission can also be revealed by the numerical simulations and can be explained with a simplified picture. The DDI induced nonlinearity gives rise to highly nonclassical photon emission from the cavity that is significant for quantum information processing and quantum communication.