Comment on "Experimental demonstration of a universally valid error-disturbance uncertainty relation in spin measurements"

TL;DR

This paper critically examines an experimental claim of a universally valid uncertainty relation in spin measurements, arguing that the results do not justify the claimed violation of the Heisenberg-type uncertainty principle.

Contribution

It provides a critical analysis showing that the experimental results cannot be used to establish a violation of the Heisenberg uncertainty relation.

Findings

The experimental results do not justify the claimed violation.

The experiments cannot be recognized as establishing a violation of the Heisenberg-type uncertainty relation.

The critique challenges the interpretation of the original experimental data.

Abstract

In this comment we show that the experimental results for a universally valid uncertainty relation in ref.[J. Erhart et al. Nat. Phys.(2012)10.1038/nphys2194]cannot be justified. The experiments cannot be recognized to establish a violation of the Heisenberg-type uncertainty relation suggested by Ozawa[Phys. Lett. A318(2003)21, Phys. Rev. A67(2003)042105].