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Modern Physics Letters B

ELECTRON SHELVING INDUCED SQUEEZING IN FLUORESCENT LIGHT EMITTED BY COLD 4 He ATOMS IN AN OPTICAL LATTICE: COHERENT CONTROL BY A WEAK AXIAL MAGNETIC FIELD

Aranya B. Bhattacherjee

Published Aug 30, 2001• 2 citations
Publisher

Abstract

We report theoretical calculations on the effect of polarization gradient, atomic motion and an axial magnetic field on quantum noise reduction in the resonant fluorescence emitted by a cloud of cold Helium atoms in an optical lattice. The polarization gradient induces squeezing of the electromagnetic field at selected points on the optical lattice, together with a dark resonance in the emitted fluorescence, the origin of which is traced back to electron shelving. We find that the localization of the atoms in the optical lattice destroys squeezing, but can be recovered in the presence of an axial magnetic field.

DOI
10.1142/s0217984901002609

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We report theoretical calculations on the effect of polarization gradient, atomic motion and an axial magnetic field on quantum noise reduction in the resonant fluorescence emitted by a cloud of cold Helium atoms in an optical lattice. The polarization gradient induces squeezing of the electromagnetic field at selected points on the optical lattice, together with a dark resonance in the emitted fluorescence, the origin of which is traced back to electron shelving. We find that the localization of the atoms in the optical lattice destroys squeezing, but can be recovered in the presence of an axial magnetic field.
We report on the theoretical calculations of the effect of the polarization gradient and an axial magnetic field on quantum noise reduction and quantum jumps in the resonance fluorescence emitted by cold metastable helium atoms confined in an optical lattice. We find that the localization of the atoms in the optical lattice destroys the non-classical properties of the emitted light but can be recovered in the presence of an axial magnetic field. The polarization gradient induces electron shelving at selected points (z = nλ/4) on the optical lattice. At these selected points, squeezing is maximized.
The electron shelving effect significantly improves the control accuracy of medium energy level transitions, enabling high-sensitivity fluorescence signal detection in precision spectroscopy and quantum metrology and thus allowing a more precise investigation of the microstructure and dynamical behavior of the medium. Here, we investigate theoretically the fluorescence properties of bichromatically driven three-level atoms with electron shelving effect under strong coupling conditions. The physical process by which the electron shelving effect leads to the appearance of two types of peaks in the central peaks of multiple Mollow triplets is explored. This phenomenon is attributed to the different orientations of electric dipole moments in fluorescence emission process caused by a nonresonant weak field. Due to the disappearance of the central broad peak of the central Mollow triplet caused by the quantum interference, the pure sharp peak survives completely induced by the electron shelving effect. The physical picture of the two-mode squeezing effect in out-of-phase quadrature noise spectra originating from the asymmetrical fluorescence operators induced by the nonresonant weak field is revealed. Moreover, the frequency range and degree of two-mode squeezing can be improved by appropriately increasing the Rabi frequency of the weak field. These results not only are helpful for realizing the electron shelving effect experiment in polychromatic strong-coupling systems but also provide a scheme for developing nonclassical spectroscopy and quantum precision measurement based on the electron shelving effect.
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.
We study the interaction of a nearly resonant linearly polarized laser beam with a cloud of cold cesium atoms in a high finesse optical cavity. We show theoretically and experimentally that the cross-Kerr effect due to the saturation of the optical transition produces quadrature squeezing on both the mean field and the orthogonally polarized vacuum mode. An interpretation of this vacuum squeezing as polarization squeezing is given and a method for measuring quantum Stokes parameters for weak beams via a local oscillator is developed.