# Relational analysis of the Frauchiger--Renner paradox and interaction-free detection of records from the past

## TL;DR

This paper analyzes the Frauchiger-Renner paradox within the relational interpretation of quantum mechanics, showing the paradox disappears under certain assumptions and introducing an interaction-free method to detect past records.

## Contribution

It provides a relational perspective on the paradox and proposes a novel interaction-free detection scheme for records from the past.

## Key findings

- The paradox is resolved when rejecting unvalidated certainty transfer.
- An interaction-free detection scheme for past records is introduced.
- The analysis clarifies the role of records in quantum paradoxes.

## Abstract

We present an analysis of the Frauchiger-Renner Gedankenexperiment from the point of view of the relational interpretation of quantum mechanics. Our analysis shows that the paradox obtained by Frauchiger and Renner disappears if one rejects promoting one agent's certainty to another agent's certainty when it cannot be validated by records from the past. A by-product of our analysis is an interaction-free detection scheme for the existence of such records.