title: Ratcheting up energy by means of measurement.
abstract: The destruction of quantum coherence can pump energy into a system. For our examples this is paradoxical because the destroyed correlations are ordinarily considered negligible. Mathematically the explanation is straightforward and physically one can identify the degrees of freedom supplying this energy. Nevertheless, the energy input can be calculated without specific reference to those degrees of freedom.
authors.affiliation: Physics Department, Clarkson University, Potsdam, New York 13699-5820, USA. schulman@clarkson.edu
authors.forename: L S
authors.initials: LS
authors.lastname: Schulman
authors.forename: B
authors.initials: B
authors.lastname: Gaveau