Comment on the MS "Null weak values and the past of quantum particle" by Q.Duprey and A.Matzkin

TL;DR

This paper critically examines the interpretation of vanishing weak values in quantum mechanics, emphasizing their relation to probability amplitudes and revisiting prior conclusions about quantum pasts.

Contribution

It offers a reinterpretation of weak values as statements about probability amplitudes, challenging previous claims about their implications for quantum history.

Findings

Weak values are better understood as probability amplitude statements.

Reevaluation of previous conclusions about quantum pasts based on weak values.

Clarification of the conceptual role of weak values in quantum theory.

Abstract

In a recent paper \cite{Matz}, Duprey and Matzin investigeated the meaning of vanishing "weak values" (WV), and their role in the retrodiction of the past of a pre- and post-selected quantum system in the presence of interference. Here we argue that any proposition, regarding the WV values, should be understood as a statement about the probability amplitudes, and revisit some of the conclusions reached in \cite{Matz}.