Quantum mechanics is an extraordinarily successful scientific theory. But more than 100 years after it was first introduced, the interpretation of the theory remains controversial. This Element introduces some of the most puzzling questions at the foundations of quantum mechanics and provides an up-to-date and forward-looking survey of the most prominent ways in which physicists and philosophers of physics have attempted to resolve them. Topics covered include nonlocality, contextuality, the reality of the wavefunction and the measurement problem. The discussion is supplemented with descriptions of some of the most important mathematical results from recent work in quantum foundations, including Bell's theorem, the Kochen-Specker theorem and the PBR theorem.
An excellent and up-to-date overview! Good treatment of contextuality and ontological models (including the possible limitations of the latter). Interesting speculations from Adlam, including the idea that a relativistic quantum theory should probably be nonlocal in time if it's nonlocal in space (this could mean retrocausality, but it could also just mean a non-Markovian time evolution law).