Circuit Cavity QED with Macroscopic Solid-State Spin Ensembles

This thesis combines quantum electrical engineering with electron spin resonance, with an emphasis on unraveling emerging collective spin phenomena. The presented experiments, with first demonstrations of the cavity protection effect, spectral hole burning and bistability in microwave photonics, cover new ground in the field of hybrid quantum systems. The thesis starts at a basic level, explaining the nature of collective effects in great detail. It develops the concept of Dicke states spin-by-spin, and introduces it to circuit quantum electrodynamics (QED), applying it to a strongly coupled hybrid quantum system studied in a broad regime of several different scenarios. It also provides experimental demonstrations including strong coupling, Rabi oscillations, nonlinear dynamics, the cavity protection effect, spectral hole burning, amplitude bistability and spin echo spectroscopy.

Auteur
Stefan Putz completed his Ph.D. at TU Wien in the field of solid state cavity QED. As postdoctoral research associate at Princeton University he continues his research on hybrid quantum systems and novel circuit QED architectures.

Contenu

Part 1: Physical Principles.- Conned Electromagnetic Waves.- Spins in the CavityCavity QED.- Part II: Experimental Realization.- Experimental ImplementationSolid-State Hybrid Quantum System.- Part III: Main Results.- Collective Spin States Coupled to a Single Mode CavityStrong Coupling.- Spin Ensembles and Decoherence in the Strong-Coupling RegimeCavity Protection.- Engineering of long-lived Collective Dark StatesSpectral Hole Burning.- Amplitude Bistability with inhomogeneous Spin BroadeningDriven Tavis-Cummings.- Spin Echo SpectroscopySpin Refocusing.- Conclusion and Outlook.