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Acta Physica Sinica

AC-STARK SHIFT OF LEVEL IN TWO-LEVEL ATOM UNDER THE INTERACTION OF MONO-MODE QUANTIZED FIELD

Xin Ai-tang, HUANG XIANG-YOU, DONG TAI-QIAN, (1)北京大学电子学系,北京 100871; (2)北京大学物理系,北京 100871; (3)山东工业大学电子工程系,济南 250061

Published Jan 1, 2000• 0 citations
Publisher

Abstract

By analyzing the phase of transition probability amplitude,a formula for level shift induced by the time-dependent perturbation of quantum transition is given.AC-Stark shifts of the levels in two-level atoms are calculated,which are induced by mono-mode quantized field.The calculated results indicate that the quantum statistic property can directly influence the atomic level shift.

DOI
10.7498/aps.49.2146

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By analyzing the phase of transition probability amplitude,a formula for level shift induced by the time-dependent perturbation of quantum transition is given.AC-Stark shifts of the levels in two-level atoms are calculated,which are induced by mono-mode quantized field.The calculated results indicate that the quantum statistic property can directly influence the atomic level shift.
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In this paper, we investigated the dynamics of atomic entanglement in a quantum system consisting of two identical two-level atoms (qubits) resonantly interacting with a mode of a thermal cavity field through degenerate two-photon transitions, in the presence of a Stark energy level shift. An analytical expression is obtained for the atom entanglement (negativity) parameter for separable and entangled initial states of atoms. The influence of the Stark shift on the degree of atom-atom entanglement is considered. It is established that the Stark shift leads to a significant increase in the degree of atom entanglement in the case of separable initial states of atoms and to stabilization of atomic entanglement in the case of entangled initial states of atoms.