Feedback Cooling of a Single Trapped Ion
Pavel A. Bushev, D. Rotter, Alex Wilson, François Dubin, Christoph Becher, Jürgen Eschner, R. Blatt, Viktor Steixner, Peter Rabl, P. Zoller · Physical Review Letters · 2006
Based on a real-time measurement of the motion of a single ion in a Paul trap, we demonstrate its electromechanical cooling below the Doppler limit by homodyne feedback control (cold damping). The feedback cooling results are well described by a model based on a quantum mechanical master equation.