Atomic-dipole squeezing for arbitrarily prepared atom and field in multi-photon interaction

Rui-Hua Xie, Qin Rao

Rui‐Hua Xie, Qin Rao

In our preceding serial works, we have investigated the generation of higher-order atomic dipole squeezing (HOADS) in a high-Q micromaser cavity, discussing the effects of dynamic Stark shift, atomic damping, atomic coherence and nonlinear one-photon processes and different initial states (for example, correlated and uncorrelated states, superposition states, squeezed vacuum). In this paper, we continue to study HOADS in a high-Q micromaser cavity, but consider that the atom interacts with the optical field via a multi-photon transition process and that the initial atom is arbitrarily prepared. For a vacuum initial field, we demonstrate that HOADS cannot occur if the atom is initially prepared in a chaotic state and that a coherent atomic state generates less efficient and stable HOADS than an arbitrary one. It is found that large detuning may lead to enhanced and strong HOADS.

Renguo Xie, Qin Rao

Tahira Nasreen, M. S. K. Razmi

Atomic-dipole squeezing in the presence of the Stark shift in two-photon Jaynes-Cummings model for an atom initially prepared in a coherent superposition of states, interacting with the coherent- or squeezed-vacuum-state field, is studied. Closed expressions for dispersive and absorptive components of the dipole for the coherent-field input under the large-n\ifmmode\bar\else\textasciimacron\fi{} approximation are derived. It is shown that atomic-dipole squeezing is sensitive to both the phase of the initial field and the relative phase between the two atomic levels. Our results show that, for certain choices of these phases, permanent dipole squeezing can be obtained.

Dan Yao, Guang‐Can Guo

Stephen Mark Barnett, P. L. Knight

We discuss the squeezing of vacuum fluctuations by resonant interaction with a suitably prepared atom. We demonstrate the crucial role of atomic dipole fluctuations in modifying the vacuum noise. We show how the generation of field squeezing in spontaneous and fluorescent processes is dependent on the squeezing of the atomic dipole.