Steady-state populations of a driven three-level atom in a broad-band squeezed vacuum |
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| Authors: | Z-C Wang Z-Y Chen Y Xu |
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| Institution: | (1) CCAST (World Laboratory), P.O. Box 8730, Beijing 100080, P.R. China, CN;(2) Department of Physics, Lanzhou University, Lanzhou 730000, P.R. China, CN |
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| Abstract: | A theoretical study is made of the steady-state populations of a three-level atom in a ladder configuration, driven by a superposition
of a monochromatic laser wave with a broad-band squeezed vacuum. The master equation for the system and the atomic Bloch equations
are derived. The steady-state populations are calculated numerically and shown graphically as functions of two-photon detuning
for various cases of the squeezed vacuum. It is shown that, the atomic populations depend strongly on the relative phase of
the driving field and the squeezed vacuum. When the phase matching condition is fulfilled, there will be a strong two-photon
resonant absorption from the squeezed vacuum, a characteristic different from absorption of photons from a classical field.
Received: 28 May 1997 / Revised and Accepted: 10 December 1997 |
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| Keywords: | PACS 42 50 Dv Nonclassical field states squeezed antibunched and sub-Poissonian states operational definitions of the phase of the field phase measurements |
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