Collapse-in and Collapse-out in Partial Measurement in Quantum Mechanics and its WISE Interpretation

TL;DR

This paper generalizes the quantum measurement postulate to partial measurements, explaining how wavefunctions collapse or shift between measured and unmeasured parts, with an interpretation based on the WISE framework.

Contribution

It introduces a novel generalization of the measurement postulate for partial measurements and offers an explanation within the WISE interpretation.

Findings

Wavefunction collapses into eigenstates of the measured part.

Wavefunction shifts to unmeasured parts upon partial measurement.

Provides a new perspective on measurement in quantum mechanics.

Abstract

In this short communication, I gave a generalization of measurement postulate in quantum mechanics. It is regarding the case with partial measurement, namely, measurement on only part of a wave function. Upon a partial measurement, the wavefunction will either collapse in one of the eigenstate covered by the measured partial wavefunction; or collapses out of the measured part and shifts to the unmeasured part. An explanation in the WISE (Wavefunction Is System Entity) interpretation is given.