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Optics Communications

Polarization gradient induced electron shelving in cold helium atoms in an optical lattice: effect of axial magnetic field

Aranya B. Bhattacherjee

Published May 1, 2001• 4 citations
Publisher
DOI
10.1016/s0030-4018(01)01098-7

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arXiv:cond-mat/0406455•Jun 20, 2004•0 citations
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.
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.