Physics – Quantum Physics
Scientific paper
2012-01-31
Physics
Quantum Physics
7 pages, 6 figures. arXiv admin note: substantial text overlap with arXiv:0710.1388
Scientific paper
We study the squeezing spectrum of the resonance fluorescence from a coherently driven four-level atom in the Y-type configuration. The effects of quantum interference induced by spontaneous emission on the squeezing properties of the fluorescence radiation are investigated. It is found that the quantum interference enhances considerably the steady-state squeezing in spectral components for strong and off-resonant driving fields. The squeezing may be increased in both the inner and outer sidebands of the spectrum depending upon the choice of parameters. For some parameters, the interference can also degrade the spectral squeezing by increasing the decay rates of atomic transitions. We present a physical interpretation of our numerical results using the dressed-state description of the atom-light interaction.
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