# Spontaneous collapse by entanglement suppression

## TL;DR

This paper investigates a modified Schrödinger equation with a nonlinear term that induces disentanglement, mimicking wavefunction collapse during quantum measurement, while maintaining standard quantum predictions when entanglement is absent.

## Contribution

It introduces a nonlinear modification to quantum dynamics that models collapse and disentanglement without conflicting with causality or standard quantum mechanics.

## Key findings

- Modified equation reproduces collapse behavior during measurement
- Nonlinear term active only during subsystem interactions
- Standard quantum predictions preserved without entanglement

## Abstract

We study a recently proposed modified Schr\"{o}dinger equation having an added nonlinear term, which gives rise to disentanglement. The process of quantum measurement is explored for the case of a pair of coupled spins. We find that the deterministic time evolution generated by the modified Schr\"{o}dinger equation mimics the process of wavefunction collapse. Added noise gives rise to stochasticity in the measurement process. Conflict with both principles of causality and separability can be avoided by postulating that the nonlinear term is active only during the time when subsystems interact. Moreover, in the absence of entanglement, all predictions of standard quantum mechanics are unaffected by the added nonlinear term.