Controlling nonclassical properties of the two-photon process by a time-varying field |
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Authors: | Jia Fei Xie Shuang-Yuan and Yang Ya-Ping |
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Institution: | Department of Physics, Tongji University, Shanghai 200092, China |
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Abstract: | The interactions between a two-level atom and a field via two-photon
transition without rotating wave approximation have been
investigated. We emphasize the dynamic behaviors of the atomic
population inversion, the field squeezing, and the atomic dipole
squeezing numerically when the field frequency varies with time in
the forms of sine and rectangle. Some interesting phenomena are
discovered and discussed. The good periodic character of the atomic
population inversion in the standard two-photon Jaynes--Cummings
model is weakened by the influence of the sine field frequency
modulation. The rectangular field frequency modulation can change
the correlation among different oscillations suddenly and induce new
collapse-revival processes of the atomic population inversion. The
field squeezing increases at the beginning of time, but then
decreases and loses as the time increases after it reaches the
maximum due to the sine modulation. The effects of the rectangular
modulation on the field squeezing depend mostly on the appearance
time of the modulation. The atomic dipole squeezing is weakened
under the influence of the sine or rectangular modulation. Our
results indicate that it is possible to perform the dynamic
controlling of the system properties by changing the parameters of
the system with time. This implies that one can dynamically control
a quantum information process by choosing the system modulation
properly. |
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Keywords: | two-photon transition quantum
controlling field squeezing |
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