https://doi.org/10.1007/s100510050368
Steady-state populations of a driven three-level atom in a broad-band squeezed vacuum
1
CCAST (World Laboratory), P.O. Box 8730, Beijing 100080,
P.R. China
2
Department of Physics, Lanzhou University, Lanzhou 730000, P.R. China
Corresponding author: a xinghz@lzu.edu.cn
Received:
28
May
1997
Accepted:
10
December
1997
Published online: 15 July 1998
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.
PACS: 42.50.Dv – Nonclassical field states; squeezed, antibunched, and sub-Poissonian states; operational definitions of the phase of the field; phase measurements
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1998
