  Periodic signals in electrical and electronic equipment can cause
interference in nearby devices. Randomized modulation of those signals spreads
their energy through the frequency spectrum and can help to mitigate
electromagnetic interference problems. The inherently random nature of quantum
phenomena makes them a good control signal. I present a quantum modulation
method based on the random statistics of quantum light. The paper describes
pulse width modulation schemes where a Poissonian light source acts as a random
control that spreads the energy of the potential interfering signals. I give an
example application for switching-mode power supplies and comment the further
possibilities of the method.
