# A Consistent Approach to Modeling Quantum Observers

## TL;DR

This paper proposes a new way to model quantum observers to avoid contradictions in quantum theory scenarios.

## Contribution

A constructive approach to modeling quantum observers that avoids contradictions in Wigner’s Friend scenarios.

## Key findings

- Quantum observers can be modeled using quantum circuits with properly qualified true statements.
- The methodology resolves the Frauchiger-Renner paradox with consistent and true statements from all agents.
- No-go theorems rely on incorrect assumptions about quantum agent behavior.

## Abstract

A number of no-go theorems have shown that Wigner’s Friend scenarios combined with various metaphysical assumptions lead to contradictions in any version of quantum theory. We present an alternative constructive approach that only assumes that agents make properly qualified true statements. Quantum observers are modeled rigorously, although simplistically, using quantum circuits. Terminology is suggested to help avoid contradictions. Our methodology is applied to the Frauchiger-Renner paradox and results in statements by all agents that are both true and consistent. Quantum theory evades the no-go theorems because they make an incorrect implicit assumption about how quantum agents behave.