Abstract
Matter-field interaction finds its simplest implementation in Cavity Quantum Electrodynamics (CQED). A single two-level atom is coupled to a few photons stored in a single mode of a high-quality resonator. In the strong-coupling regime, the coherent atom-field interaction overwhelms dissipative processes. This situation illustrates the basic quantum postulates. It is also ideal for the exploration of the quantum-classical boundary and for the realization of quantum information protocols. We briefly describe the general frame of CQED. We illustrate its fundamental interest by discussing two recent experiments, performed with circular Rydberg atoms and superconducting millimeter-wave cavities.
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