Quantum mechanics without measurements

Details Quantum mechanics without measurements Quantum mechanics without measurements

2006-12-08

arxiv.org/abs/quant-ph/0612065v1

Physics

Quantum Physics

Latex 22 pages, 3 figures in text using PSTricks

Scientific paper

Many of the conceptual problems students have in understanding quantum mechanics arise from the way probabilities are introduced in standard (textbook) quantum theory through the use of measurements. Introducing consistent microscopic probabilities in quantum theory requires setting up appropriate sample spaces taking proper account of quantum incompatibility. When this is done the Schrodinger equation can be used to calculate probabilities independent of whether a system is or is not being measured, and the results usually ascribed to wave function collapse are obtained in a less misleading way through conditional probabilities. Toy models that include measurement apparatus as part of the total quantum system make this approach accessible to students. Some comments are made about teaching this material.

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