Some Remarks on Unsharp Quantum Measurements,Quantum Non-Demolition,and All That |
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Authors: | Paul Busch Pekka J. Lahti |
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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. |
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