In 1930, Einstein argued against the consistency of the time-energy uncertainty relation by discussing a thought experiment involving a measurement of the mass of the box which emitted a photon. Bohr seemingly prevailed over Einstein by arguing that Einstein's own general theory of relativity saves the consistency of quantum mechanics. We revisit this thought experiment from a modern point of view at a level suitable for an undergraduate readership and find that neither Einstein nor Bohr was correct. Instead, this thought experiment should be thought of as an early example of a system demonstrating nonlocal ‘EPR’ quantum correlations, five years before the famous Einstein-Podolsky-Rosen paper.
European Journal of Physics
- Pub Date:
- September 2012
- Quantum Physics;
- General Relativity and Quantum Cosmology;
- Physics - History and Philosophy of Physics
- 11 pages, revised, accepted for publication in Eur. J. Phys