What happens if measure the electron spin twice?

TL;DR

This paper proposes a thought experiment to test whether quantum state collapse occurs during electron spin measurement by performing sequential measurements along different axes, potentially distinguishing between collapse and non-collapse interpretations.

Contribution

It introduces a simple, idealized experiment to empirically test the existence of wavefunction collapse in quantum measurements.

Findings

Different outcomes predicted by collapse and no-collapse theories.

Provides a feasible experimental setup to test quantum measurement interpretations.

Clarifies the implications of sequential spin measurements on quantum state collapse.

Abstract

The mainstream textbooks of quantum mechanics explains the quantum state collapses into an eigenstate in the measurement, while other explanations such as hidden variables and multi-universe deny the collapsing. Here we propose an ideal thinking experiment on measuring the spin of an electron with 3 steps. It is simple and straightforward, in short, to measure a spin-up electron in x-axis, and then in z-axis. Whether there is a collapsing predicts different results of the experiment. The future realistic experiment will show the quantum state collapses or not in the measurement.