Abstract
The magnetic field control of spontaneous emission in a four-level atomic system driven by three fields is studied. Using the iterative method, an analytical expression of the spontaneous emission spectrum is obtained. Given that the dipoles of the two transitions from two upper levels to a common lower level are orthogonal, we discuss the influence of the magnetic field which is used to couple the two upper levels on the spontaneous emission spectrum, and find a conversion between destructive and constructive quantum interference by changing Larmor frequency. When introducing the interference between the two transitions, the extremely narrow spectral line is obtained in the emission spectrum, which has a potential application in the high spatial resolution sub-wavelength atom localization.
Published Version
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