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Physical Review A

Resonance fluorescence spectra and squeezing properties of a bichromatically driven four-level atom

Matthias Jakob, János A. Bergou

Published Nov 1, 1999• 9 citations
Publisher

Abstract

The polarization-dependent resonance-fluorescence spectra of a bichromatically driven four-level atom are studied. It is shown that very narrow spectral lines can occur in the incoherent part of the spectra for polarization directions that are different from that of the driving field. Squeezing properties of the fluorescent light are also investigated. The degree of squeezing depends on the polarization direction and reaches a maximum of remarkably $56%.$

DOI
10.1103/physreva.60.4179

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The polarization-dependent resonance-fluorescence spectra of a bichromatically driven four-level atom are studied. It is shown that very narrow spectral lines can occur in the incoherent part of the spectra for polarization directions that are different from that of the driving field. Squeezing properties of the fluorescent light are also investigated. The degree of squeezing depends on the polarization direction and reaches a maximum of remarkably 5656%.56
We examine the correlation between photons in the resonance fluorescence of a bichromatically driven four-level atom. The four-level atom consists of two twofold degenerate states and, as a consequence, spontaneous emission events become sensitive to polarization. Depending on the interaction strength with the bichromatic field as well as its polarization direction, nonlinear two-photon emission takes place which, in turn, leads to extremely strong correlations between certain polarized photons. On the other hand, correlations between photons differently polarized from the distinctive ones are suppressed. Thus, the light source establishes a promising candidate for the generation of Bell-type correlated photon pairs. We explain the unusual large correlations with a nonlinear four-photon process which crucially depends on the strength of the driving as well as its polarization.
The squeezed light has been applied widely in our life.We can get the quartered squeezing spectra from the resonance fluorescence of a two-level atom driven by a monochromatic field.It shows that the squeezing spectra will change markedly with the varieties of the intensity and the frequency of the driving field.The appearance of the squeezing on in-phase or on out-phase,and the degree of the squeezing,and the number of the squeezing modes are all controlled via changing the intensity and the frequency of the monochromatic driving field.
The incoherent part of the Mollow spectrum for resonance fluorescence has a subnatural linewidth in the weak-field limit. We show that this is due to squeezing of the fluctuations in the induced atomic dipole. The reduced linewidth persists for driving field intensities of approximately 12% of the saturation intensity, where Rabi sidebands begin to appear. We find a similar linewidth narrowing in the transmitted and fluorescent spectra for a single atom in a weakly driven resonant cavity. In this system single-quantum frequency splitting can produce a two-peaked spectrum. Both peaks have a narrowed linewidth. The spectrum of the transmitted light shows a second nonclassical effect that is due to squeezing. A spectral hole may appear at line center, giving a two-peaked spectrum even when there is no frequency splitting.
Abstract The squeezing spectrum of the fluorescence field emitted from a four-level atom in J = 1/2 to J = 1/2 configuration driven by two coherent fields is studied. We find that the squeezing properties of the fluorescence radiation are significantly influenced by the presence of vacuum-induced coherence in the atomic system. It is shown that such coherence induces spectral squeezing in phase quadratures of the fluorescence light for both weak and strong driving fields. The dependence of the squeezing spectrum on the relative phase of the driving fields is also investigated. Effects such as enhancement or suppression of the squeezing peaks are shown in the spectrum as the relative phase is varied. An analytical explanation of the numerical findings is presented using dressed-states of the atom-field system.
Fluorescence from a coherently driven two-level atom that is damped by a squeezed vacuum is studied. We show that the mean atomic polarization depends on the relative phases of the squeezed vacuum and the coherent driving field. The fluorescent spectrum is calculated and shows several modifications over the spectrum for normal resonance fluorescence. In particular, the central peak of the Mollow triplet has a linewidth that depends on the phase of the driving field. For strong squeezing this peak can either be much narrower or much broader than the natural linewidth of the atom.