  We propose a method to design a suboptimal, coherent quantum LQG controller
to solve a quantum equalization problem. Our method involves reformulating the
problem as a control problem and then designing a classical LQG controller and
implementing it as a quantum system. Illustrative examples are included which
demonstrate the algorithm for both active and passive systems, i.e., systems
where the dynamics are described in terms of both position and momentum
operators and systems with dynamics in terms of annihilation operators only.
