Coherent control of interference processes in radiative decays |
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Authors: | E A Gazazyan V Chaltykyan A Gazazyan |
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Institution: | (1) State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing, 100871, China;(2) State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan, 030006, China;(3) Department of Physics, Tongji University, Shanghai, 200092, China;(4) Beijing Computational Science Research Center, Beijing, 100084, China |
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Abstract: | Possibility of coherent control of spontaneous emission from four- and five-level system
in the laser radiation field is studied. The four-level system consists of two levels
resonantly driven by laser radiation where either of levels may decay to a separate level.
For such a system, we show that the presence of the second decay channel may deteriorate
the destructive interference occurring in case of one decay channel because of
Autler-Townes effect. The five-level diagram represents two two-level resonantly driven
systems with the upper levels decaying to a common level. For this diagram, interference
between the two decay channels takes place and it is partially or completely destructive
or constructive depending on the initial conditions and on the mutual orientation of the
transition dipole moments. It is shown that population transfer takes place by the
same quantum vacuum via spontaneous emission. The populations are shown
to have damping oscillatory nature. |
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Keywords: | |
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