Abstract
Cavity Quantum Electrodynamics (CQED) studies the interaction of atoms with photons stored in cavities. In the microwave domain, it consists in coupling large electric dipole carrying Rydberg atoms to a very high Q superconducting cavity. With this system, fundamental tests of quantum physics have been realized, including the generation and reconstruction of Schrödinger cat states of light and the observation of their decoherence. Basic quantum information procedures have also been demonstrated. During the last decade, microwave CQED has been extended into a new domain of mesoscopic physics called "Circuit QED", where artificial two-level atoms made of superconducting Josephson junctions interact with high Q radiofrequency resonators. These systems, based on well-developed solid state technology are very promising for quantum information science. Atomic CQED and Circuit QED bear strong similarities and also present some marked differences which will be illustrated by recent experiments performed in both fields.
© 2015 IEEE
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