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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 this book, hybrid systems based on yttrium-iron-garnet (YIG), three dimensional microwave cavity resonators, and superconducting transmon qubits, are investigated by continuous wave and pulsed microwave spectroscopy. Limitations to the magnetic linewidth in the quantum regime are identified and coherent exchange between a magnon and a superconducting qubit are demonstrated. Finally, a first step towards a strongly coupled hybrid system containing all three components is demonstrated.
Physics --- low temperature physic --- hybrid quantum systems --- quantum magnonics --- Tieftemperaturphysik --- Hybride Quantensysteme --- Quanten-Magnonics
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