How the Natural Interpretation of QM Avoids the Recent NoGo Theorem
Abstract
A recent nogo theorem gives an extension of the Wigner's Friend argument that purports to prove the "Quantum theory cannot consistently describe the use of itself." The argument is complex and thought provoking, but fails in a straightforward way if one treats QM as a statistical theory in the most fundamental sense, i.e. if one applies the socalled ensemble interpretation. This explanation is given here at an undergraduate level, which can be edifying for experts and students alike. A recent paper has already shown that the nogo theorem is incorrect with regard to the de Broglie Bohm theory and misguided in some of its general claims. This paper's contribution is three fold. It shows how the extended Wigner's Friend argument fails in the ensemble interpretation. It also makes more evident how natural a consistent statistical treatment of the wave function is. In this way, the refutation of the argument is useful for bringing out the core statistical nature of QM. It, in addition, manifests the unnecessary complications and problems introduced by the collapse mechanism that is part of the Copenhagen interpretation. The paper uses the straightforwardness of the ensemble interpretation to make the nogo argument and its refutation more accessible.
 Publication:

Foundations of Physics
 Pub Date:
 February 2020
 DOI:
 10.1007/s1070102000323x
 arXiv:
 arXiv:1910.10131
 Bibcode:
 2020FoPh...50..204R
 Keywords:

 Quantum mechanics;
 Ensemble;
 Collapse;
 Interpretation of quantum mechanics;
 Wigner's Friend;
 Quantum Physics
 EPrint:
 Accepted for publication in Foundations of Physics