Repeating this process very frequently results in a "freezing" of the system state, a phenomenon known as the quantum Zeno effect.
According to Neumark's theorem, one of these realizable actions can always be constructed for a given positive value operator. The resolution of the consistency problem associated with this action(*) requires that it be irreversible. Repeating this process very frequently results in a "freezing" of the system state, a phenomenon known as the quantum Zeno effect. Mathematically, this process can be thought of as the forced projection of the system state onto an eigenstate of the Hamiltonian, and according to the Heisenberg uncertainty principle, this process cannot be performed simultaneously with arbitrary accuracy for non-commuting observables. For 10 points, identify this action which in von Neumann's formalism of quantum mechanics results in the collapse of the wave function to an energy eigenstate.
According to Neumark's theorem, one of these realizable actions can always be constructed for a given positive value operator.
measurement or observation [accept experiment before *]