The interaction between matter and light represents a fundamental process in physics. In this thesis, we investigate both theoretically and experimentally such a process pursuing three different paths, which are all related to the realm of superconducting circuit quantum electrodynamics (QED). First, we present experimental results on the measurement of the statistical properties of vacuum fluctuations at microwave frequencies. This is realized by means of a cross-correlation homodyne detection scheme, which we have developed. Second, we propose the implementation of a two-resonator circuit QED setup, where two resonators are coupled to one superconducting qubit. Third, we study the symmetry properties and selection rules of a circuit QED system based on a flux qubit and analyze the upconversion dynamics associated with a two-photon Jaynes-Cummings-type interaction.
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The interaction between matter and light represents a fundamental process in physics. In this thesis, we investigate both theoretically and experimentally such a process pursuing three different paths, which are all related to the realm of superconducting circuit quantum electrodynamics (QED). First, we present experimental results on the measurement of the statistical properties of vacuum fluctuations at microwave frequencies. This is realized by means of a cross-correlation homodyne detection...
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