Retrieving "Heisenberg Cut" from the archives

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1. Measurement Problem

   Linked via "Heisenberg Cut"

   where $|M1\rangle$ and $|M2\rangle$ represent the device registering the respective outcomes. The measurement problem then shifts: why do we never observe macroscopic devices existing in these fuzzy, entangled states?
   The boundary separating the quantum realm (where superposition reigns) and the classical realm (where single outcomes dominate) is often referred to as the Heisenberg Cut or the Shifting Datum. Various proposed solutions attempt to locate this boundary, often by introducing mechanisms contingent upon the scale or complexity of the observer.…