Appears in collection : PRACQSYS 2018: Principles and Applications of Control in Quantum Systems

Accurately characterizing the spectral properties of environmental noise in open quantum systems is both a prerequisite for quantitative modeling and prediction, and a key step toward optimizing control performance for high-fidelity quantum information processing and quantum science applications. I will describe recent theoretical advances in developing quantum control methods for spectral estimation using qubit-based sensors, as well as proof-of-principle experimental validations using trapped-ion and superconducting qubit devices.