Domain
State of the field
The formalism is unreasonably accurate; its interpretation is unsettled. Measurement, nonlocality, and the status of the wavefunction remain contested a century on.
Measured correlations between entangled photons violate Bell inequalities, ruling out local hidden-variable explanations of quantum correlations.
A 1.3 km electron-spin experiment closed the detection and locality loopholes simultaneously, confirming Bell violations under the strictest conditions.
Einstein, Podolsky and Rosen argued that quantum mechanics is either incomplete or permits "spooky" nonlocal influence, framing the debate later settled empiric…