Abstract
We have made a quantitative study of quantum electrodynamic corrections to the atomic energy levels between parallel conducting mirrors. Within the framework of simple two-level atoms, we evaluate the level shifts numerically and discuss the van der Waals, Casimir, and cavity-resonant radiative shifts as their asymptotic forms. In particular, we find that the level shifts of an excited state are substantially different not only from those of a classical dipole radiator but also from those of an excited atom near a single mirror. For the ground state, however, the shifts are qualitatively similar to those near a single mirror. We also apply the results to some simple atomic systems that may be used to test the cavity QED theory.
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