Some Remarks on Unsharp Quantum Measurements, Quantum Non‐Demolition, and All That
Paul Busch, PEKKA J. LAHTI
Abstract The theory of unsharp quantum measurements is reviewed as a generalization of the von Neumann‐Lüders measurement theory and applied to measurements of continuous quantities. A generalized notion of repeatability is proposed which is applicable even to intrinsically unsharp continuous observables. As an illustration a precise formulation of a quantum non‐demolition (QND) measurement performed on a harmonic oscillator is given.
Annalen der Physik•Jan 1, 1990•28 citations