Energy Non-conservation in Quantum Mechanics

We study the conservation of energy, or lack thereof, when measurements are performed in quantum mechanics. The expectation value Hamiltonian a system can clearly change wave functions collapse accordance with standard textbook (Copenhagen) treatment measurement, but one might imagine that energy is compensated by measuring apparatus environment. show this not true; state after measurement be arbitrarily large, independent physical process. In Everettian theory, while conserved for function universe (including all branches), it constant within individual worlds. It should therefore possible to experimentally measure violations and we suggest an experimental protocol doing so.