Measurement, dissipation, and quantum control with superconducting circuits

Patrick Harrington, PhD Defense

The interaction between a superconducting circuit and its environment can cause decoherence. However, interactions with an environment are necessary for quantum state preparation and measurement. Through the dynamics of open quantum systems, the environment is a resource to control and readout superconducting circuit states. I will present an experimental result demonstrating qubit state stabilization from engineered dissipation with a microwave photonic crystal. In addition, I will discuss measurements of continuous quantum trajectories with a superconducting qubit. These results highlight how interactions at the classical-quantum boundary are essential for quantum control.