# How to Ensure Logical Consistency of Quantum Theory

## TL;DR

This paper examines the logical consistency of quantum theory through Gedankenexperiments and proposes an approach to achieve observer-independent, consistent predictions within quantum mechanics.

## Contribution

It introduces a novel approach that ensures the logical consistency of quantum theory regardless of the observer, addressing foundational issues highlighted by recent Gedankenexperiments.

## Key findings

- Demonstrates inconsistencies in current quantum interpretations
- Proposes a method for observer-independent predictions
- Supports the universal applicability of quantum theory

## Abstract

Predictions of quantum theory have been confirmed experimentally in the microscopic domain with no known exceptions. This success motivates physicists to assume universal validity of the theory. To put the predictions of the quantum theory to the test in the domain of more complex systems researchers like e.g. Eugene Wigner have proposed carefully designed Gedankenexperiments revealing unexpected difficulties of the theory. Daniela Frauchiger and Renato Renner have recently suggested an extension of the Gedankenexperiment commonly known as Wigner's friend and arrived at a conclusion that one agent, upon observing a particular measurement outcome, must conclude that another agent has predicted the opposite outcome with certainty. Their analysis shows that quantum theory cannot consistently describe the use of itself. Here, we will study the mentioned Gedankenexperiments and introduce an approach leading to consistent predictions of quantum theory, independent of observer using the theory.