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Paper detail

Quantum-mechanical measurement apparatus as a black box

It is commonly believed that the most general type of a quantum-mechanical measurement is one described by a positive-operator valued measure (POVM). In the present paper, this statement is proven for any measurements on quantum systems with a finite-dimensional state space. The proof of POVM nature of an arbitrary measurement is carried out using a purely operational approach, which is fully ignorant about what is inside a measurement apparatus. The suggested approach gives also an opportunity to derive the Born rule.

preprint2014arXivOpen access
A. V. Nenashev
quant-ph
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A. V. Nenashev

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