Quantum system characterization with limited resources

Understand

The construction and operation of large scale quantum information devices presents a grand challenge.

• A major issue is the effective control of coherent evolution, which requires accurate knowledge of the system dynamics that may vary from device to device.
• We review strategies for obtaining such knowledge from minimal initial resources and in an efficient manner, and apply these to the problem of characterization of a qubit embedded into a larger state manifold, made tractable by exploiting prior structural knowledge.
• We also investigate adaptive sampling for estimation of multiple parameters.