Cavity quantum electrodynamics using a near-resonance two-level system: Emergence of the Glauber state

摘要: Random tunneling two-level systems (TLSs) in dielectrics have been of interest recently because they adversely affect the performance superconducting qubits. The coupling TLSs to qubits has allowed individual TLS characterization, which previously limited within (thin) Josephson barriers made from aluminum oxide. Here, we report on measurement an capacitor a lumped-element LC microwave resonator, forms cavity quantum electrodynamics (CQED) system and allows for characterization different structure material than demonstrated with Due reduced volume dielectric (80 μm3), even moderate thickness (250 nm), achieve strong regime as evidenced by vacuum Rabi splitting observed spectrum. A coherence time 3.2 μs was film silicon nitride analyzed Jaynes-Cummings spectral model, is larger seen As drive power increased, observe unusual but explicable set continuous discrete crossovers split transitions Glauber (coherent) state.