Sayed Hassen, S. Z.Huntington, Elanor H.James, Matthew R.Petersen, Ian R.2026-07-032026-07-03ORCID:/0000-0003-4856-9450/work/219177603https://hdl.handle.net/1885/733812762This paper considers the application of Linear Quadratic Gaussian (LQG) optimal control theory to a problem of cavity locking in quantum optics. Using an equivalence between quantum LQG control and classical LQG control, this problem is reduced to a standard LQG control problem. The cavity locking problem involves controlling the error between the laser frequency and the cavity frequency. A model for the cavity system is set up and an LQG controller is synthesized. The resulting control system implemented on an experimental cavity.en200784999293596