Enlarge / The atoms (center foreground) alter the laser so it extracts energy from a membrane (blue). (credit: Departement Physik, Universität Basel )
Way back when I was still working in the lab, there was a new lot of buzz about something called “coherent control. ” The basic idea was to take the principles of traditional control theory—the same theory that makes things like cruise control work—and apply them to quantum systems.
Some very cool ideas and insights came out of that early work, but this has taken a while to put them into practice. Now, we might be starting in order to see some practical applications emerging, with researchers demonstrating in a new paper the active cooling of a membrane using coherent control.
Measurement is bad
A traditional control system has something like a desired state, such as the target speed associated with a car. By repeatedly measuring the speed of a car and accelerating or decelerating, the particular control system can bring typically the car to the target speed.
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