Wigner's friends, tunnelling times and Feynman's "only mystery of quantum mechanics"

TL;DR

This paper discusses the core mystery of quantum mechanics, as identified by Feynman, in light of recent claims challenging the internal consistency and behavior of quantum theory.

Contribution

It clarifies the fundamental mystery of quantum mechanics and analyzes recent claims that question the theory's internal consistency and behavior.

Findings

Reaffirmation of Feynman's 'only mystery' as central to quantum mechanics

Analysis of recent claims questioning quantum theory's internal consistency

Discussion on the implications of tunnelling times and Wigner's friends paradox

Abstract

Recent developments in elementary quantum mechanics have seen a number of extraordinary claims regarding quantum behaviour, and even questioning internal consistency of the theory. These are, we argue, different disguises of what Feynman described as quantum theory's "only mystery".