We study the interplay of superconducting quantum circuits and fundamental properties of microwave states. In particular, we analyze loss mechanisms in coplanar waveguide resonators and in superconducting quantum bits. Using quantum bits as detectors, we show the super-Poissonian photon statistics of weak thermal microwaves. We confirm this result by direct measurements of the microwave fields using near-quantum-limited amplifiers. Finally, we study selection rules for quadrupolar quantum bits via the symmetry of microwave fields.
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We study the interplay of superconducting quantum circuits and fundamental properties of microwave states. In particular, we analyze loss mechanisms in coplanar waveguide resonators and in superconducting quantum bits. Using quantum bits as detectors, we show the super-Poissonian photon statistics of weak thermal microwaves. We confirm this result by direct measurements of the microwave fields using near-quantum-limited amplifiers. Finally, we study selection rules for quadrupolar quantum bits v...
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