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Paper detail

Quantum probabilities for time-extended measurements

We study the probability assignment for the outcomes of time-extended measurements. We construct the class-operator that incorporates the information about a generic time-smeared quantity. These class-operators are employed for the construction of Positive-Operator-Valued-Measures for the time-averaged quantities. The scheme highlights the distinction between velocity and momentum in quantum theory. Propositions about velocity and momentum are represented by different class-operators, hence they define different probability measures. We provide some examples, we study the classical limit and we construct probabilities for generalized time-extended phase space variables.

preprint2006arXivOpen access
C. AnastopoulosN. Savvidou
quant-ph
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C. AnastopoulosN. Savvidou

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