# Three-Spin Systems and the Pusey-Barrett- Rudolph Theorem

## TL;DR

This paper introduces a triple quantum dot system to experimentally test the PBR theorem, demonstrating that the epistemic interpretation of the quantum wave function conflicts with quantum theory under certain assumptions.

## Contribution

It presents a novel laboratory protocol using a three-spin system to empirically investigate the PBR no-go theorem.

## Key findings

- Epistemic interpretation contradicts quantum predictions.
- Experimental validation using a triple quantum dot system.
- Supports the ontic view of the quantum wave function.

## Abstract

The fundamental nature of quantum wave function has been the topic of many discussions since the beginning of the quantum theory. It either corresponds to an element of reality $(\Psi-ontic)$ or it is a subjective state of knowledge about the underlying reality $(\Psi-epistemic)$. Pusey, Barrett, and Rudolph (PBR) have shown that epistemic interpretations of the quantum wave function are in contradiction with the predictions of quantum under some assumptions. In this paper, a laboratory protocol with a triple quantum dot will be introduced as a three-spin interaction system to study the PBR no-go theorem. By this experimental model, we show that the epistemic interpretation of the quantum state is in contradiction with quantum theory, based only on the assumption that measurement settings can be prepared freely and independently from each other.