Heisenberg cut

Etymology
Named after, who contributed to the Copenhagen interpretation of quantum mechanics, and specifically to the theory of wavefunction collapse.

Noun

 * 1)  A conceptualised division separating the quantum system being observed from the classical system that comprises the observer's information, knowledge and conscious awareness.

Usage notes

 * As a concept whose physical existence is uncertain, the Heisenberg cut is primarily of theoretical and philosophical interest.
 * The observed quantum system (everything governed by the wavefunction) is said to be below the cut. The system of the observer is said to be above the cut.
 * Interpretations of quantum mechanics that do not rely on the concept of wavefunction collapse do not require Heisenberg cuts.

Translations

 * French:
 * German: Heisenbergscher Schnitt
 * Italian: