Applied Physics Seminars Present: Ryan Hamerly, Stanford University

Advantages of Coherent Feedback in Control of Linear Quantum Systems

Classical control theory is a well-studied subject in engineering, and many of these techniques apply straightforwardly to quantum systems in the subject of measurement-based feedback control. Recently, there has been increased interest in "coherent" control techniques, where a system is controlled by coherently processing its outputs without measurement.

In this talk, I focus on a general control problem, the LQG problem, and show that for this problem coherent control strategies can always perform better than the optimal measurement-based approaches.

More about the Speaker Ryan Hamerly: Ryan Hamerly is a former Caltech undergrad and present graduate student at Stanford University working with Dr. Hideo Mabuchi. His current research involves theory on coherent-feedback quantum control ideas related to opto-mechanics.