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Acta Sinica Quantum Optica

The Effect of Photon Statistics on AC Stark Shift of Atomic Level

DONG TAI-QIAN

Published Jan 1, 2001• 0 citations
OpenAlex

Abstract

WT5BZ]Based on the AC Stark shifts of atomic level induced by the single-mode quantized field in coherent state and thermal state, the effect of photon statistics on the level shifts is analyzed. These level shifts contain the information of photon statistics, which indicates that statistical property of optical field can be studied by virtue of AC Stark effect of a atom. [WT5HZ]

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WT5BZ]Based on the AC Stark shifts of atomic level induced by the single-mode quantized field in coherent state and thermal state, the effect of photon statistics on the level shifts is analyzed. These level shifts contain the information of photon statistics, which indicates that statistical property of optical field can be studied by virtue of AC Stark effect of a atom. [WT5HZ]
By means of adiabatically eliminating the upper level or levels of a \ensuremath{\Lambda}-configuration atom coupling to a two-mode quantized field, we have studied the influences of ac Stark shifts on the atomic coherent population trapping in two important atom-field coupling systems via nondegenerate Raman two-photon processes. The states of the field that trap the atom in its two nondegenerate lower levels are obtained, and the important roles of ac Stark shifts and properties of the atomic upper level or levels in the states of the trapping field in two Raman-coupling systems are also analyzed.
In an optical Ramsey atomic interferometer using Ramsey separated oscillating fields method, AC Stark effect shows that an interference feature is superimposed on the AC Stark level shift dispersion line-shape. This phenomenon has never been observed before. In this report, an analytic expression of the AC Stark shift in optical Ramsey atomic interferometer has been derived, and the numerical result of this interesting feature has been analyzed. Finally, the condition to measure the Interference of AC Stark Effect has been discussed.
In this manuscript, we study a new non-linear system which represents a ?-type five level atom interacting with a quantized four-mode electromagnetic field. A non-linear Stark shift is introduced, through the elimination of intermediate levels (two and four) using the adiabatic elimination technique. By using the Schrodinger equation we obtain the analytic solution this model. Some statistical aspects through the effective Hamiltonian are presented such as the collapses-revivals phenomenon, degree of purity, concurrence, and the squeezing phenomenon with respect to study the effect of Stark shift parameters on these statistical aspects. For small values of the Stark shift parameter, the collapse times increase and the atomic inversion symmetry axis shifts upward, while the entanglement decreases significantly. It has been noted that the system is affected by the Stark shift parameter.