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1. Wavefunction

   Linked via "superposition"

   The Collapse Postulate
   Upon performing a measurement that projects the system onto one of its eigenstates (e.g., measuring the energy or momentum), the wavefunction is hypothesized to instantaneously "collapse" (or reduce) from a superposition of possibilities into the specific eigenstate corresponding to the measured value [4]. This non-unitary, irreversible process is one of the most debated aspects of quantum theory.
   Wavefunctions of Compos…