We design, fabricate, and measure superconducting circuits to encode and protect quantum information. We are interested in questions like: Can quantum information persist on macroscopic timescales? Can we build circuits with more exotic electronic interactions than Cooper pairing?
We study a new paradigm for encoding, protecting, and manipulating quantum information in a quantum harmonic oscillator (e.g. a high-Q mode of a 3D superconducting cavity) instead of a multi-qubit register. The infinite dimensional Hilbert space of such a system can be used to redundantly encode quantum information.
We develop systematic mathematical methods for dynamical analysis, control, and estimation of composite and open quantum systems. Our subjects of interest range from quantum input-output theory to stabilization by measurement-based quantum feedback.