POVMs and Naimark's theorem without sums

Details POVMs and Naimark's theorem without sums POVMs and Naimark's theorem without sums

2006-08-08

arxiv.org/abs/quant-ph/0608072v2

Physics

Quantum Physics

Scientific paper

We provide a definition of POVM in terms of abstract tensor structure only. It is justified in two distinct manners. i. At this abstract level we are still able to prove Naimark's theorem, hence establishing a bijective correspondence between abstract POVMs and abstract projective measurements on an extended system, and this proof is moreover purely graphical. ii. Our definition coincides with the usual one for the particular case of the Hilbert space tensor product. We also point to a very useful normal form result for the classical object structure introduced in quant-ph/0608035.

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