Preparation and measurement: two independent sources of uncertainty in quantum mechanics

Details Preparation and measurement: two independent sources of uncertainty in quantum mechanics Preparation and measurement: two independent sources of uncertainty in quantum mechanics

1999-01-07

arxiv.org/abs/quant-ph/9901010v1

Found.Phys. 30 (2000) 205-225

Physics

Quantum Physics

latex, 18 pages, 4 eps figures

Scientific paper

In the Copenhagen interpretation the Heisenberg uncertainty relation is interpreted as the mathematical expression of the concept of complementarity, quantifying the mutual disturbance necessarily taking place in a simultaneous or joint measurement of incompatible observables. This interpretation has already been criticized by Ballentine a long time ago, and has recently been challenged in an experimental way. These criticisms can be substantiated by using the generalized formalism of positive operator-valued measures, from which a new inequality can be derived, precisely illustrating the Copenhagen concept of complementarity. The different roles of preparation and measurement in creating uncertainty in quantum mechanics are discussed.

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