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This thesis presents a novel approach to the experimental realization of tunable, superconducting metamaterials. Therefore, conventional resonant meta-atoms are replaced by meta-atoms that contain Josephson junctions, which renders their resonance frequency tunable by an external magnetic field. This tunability is theoretically and experimentally investigated in one-dimensional magnetic and electric metamaterials. For the magnetic metamaterial, the effective, magnetic permeability is determined.

microwaves --- Metamaterialien --- Festkörperphysik --- low temperature physics --- solid state physics --- Tieftemperaturphysiksuperconductivity --- metamaterials --- Mikrowellen --- Supraleitung

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Quantum sensing is a vast and emerging field enabling in-situ studies of quantum systems and hence the development of quantum hybrid systems. This work creates the fundament of direct superconducting-magnetic hybrid systems by developing a local microwave sensing scheme and studying the influence of a static magnetic field on a superconducting qubit. Finally, a proof-of-principle hybrid system is demonstrated, which opens the path towards superconducting-magnetic quantum circuits.

Physics --- Quantensensorik --- Supraleitung --- Quantenbits --- Tieftemperaturphysik --- Hybridsysteme --- Quantum sensing --- superconductivity --- quantum bits --- low temperature physics --- hybrid systems

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In the THz frequency range, superconducting detectors coupled to planar antennas are well suited for the use in the field of accelerator beam diagnostics. This work studies the coupling efficiency and spectral sensitivity of different antenna designs. Based on the conclusions, two different detector systems for spectroscopic measurements are developed and verified with measurements at accelerator-based light sources.

Electrical engineering --- Supraleitung --- THz-Detektoren --- Terahertzstrahlung --- Planarantennen --- Synchrotronstrahlung --- superconductivity --- terahertz detector --- terahertz radiation --- planar antennas --- synchrotron radiation