Some Remarks on Unsharp Quantum Measurements, Quantum Non‐Demolition, and All That | Zendy

Busch Paul | Zendy; Lahti Pekka J. | Zendy

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Some Remarks on Unsharp Quantum Measurements, Quantum Non‐Demolition, and All That

Author(s) -

Busch Paul,

Lahti Pekka J.

Publication year - 1990

Publication title -

annalen der physik

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.009

H-Index - 68

eISSN - 1521-3889

pISSN - 0003-3804

DOI - 10.1002/andp.19905020502

Subject(s) - generalization , quantum , demolition , harmonic oscillator , observable , quantum mechanics , physics , von neumann architecture , statistical physics , theoretical physics , mathematics , mathematical analysis , pure mathematics , civil engineering , engineering

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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