Guaranteed Cost LQG Control of Uncertain Linear Quantum Stochastic   Systems
  In this paper, we formulate and solve a guaranteed cost control problem for a class of uncertain linear stochastic quantum systems. For these quantum systems, a connection with an associated classical (non-quantum) system is first established. Using this connection, the desired guaranteed cost results are established. The theory presented is illustrated using an example from quantum optics. 
A. J. Shaiju, I. R. Petersen, and M. R. James