No relation for Wigner's friend

TL;DR

This paper argues that Wigner's friend thought experiment does not imply observer-dependent quantum states, proposing instead that quantum collapse should be viewed as collapse of histories, not states.

Contribution

It introduces a history vector framework to reinterpret quantum collapse, challenging the observer dependence implied by the thought experiment.

Findings

Wigner's friend does not support observer-dependent states

Quantum collapse can be understood as collapse of histories

History vectors provide a new interpretative tool

Abstract

We argue that Wigner's friend thought experiment does not support observer dependence of quantum states. An analysis in terms of history vectors suggests that quantum collapse is to be understood as collapse of histories rather than collapse of states.