Circuit QED and Decoherence
Microwave cavities, dispersive coupling, noise and coherence.
Explore the 8 concepts
Concept 19Microwave resonatorsSuperconducting transmission lines form high-Q standing-wave microwave modes.Concept 20Circuit quantum electrodynamicsArtificial atoms interact with quantized microwave cavity fields.Concept 21Dispersive regimeOff-resonant coupling produces qubit-state-dependent cavity frequencies.Concept 22Qubit relaxation T1Energy decay transfers qubit excitation into environmental degrees of freedom.Concept 23Dephasing T2 and Ramsey fringesPhase coherence decays from relaxation and frequency fluctuations.Concept 24Echo and dynamical decouplingRefocusing pulses suppress certain slow fluctuations.Concept 25Quasiparticles and dielectric lossMicroscopic defects and nonequilibrium excitations limit superconducting coherence.Concept 26Thermalization and dilution refrigerationMicrowave qubits require strong thermal isolation and low effective excitation temperature.