Comment on "Non-representative Quantum Mechanical Weak Values"

TL;DR

This paper critiques Svensson's claim that weak values are invalid when the initial expectation value vanishes, demonstrating inconsistencies through various examples.

Contribution

It provides a detailed analysis and refutes Svensson's argument, showing that weak values can be meaningfully applied even when the initial expectation value is zero.

Findings

Svensson's argument is inconsistent with multiple examples.

Weak values remain valid despite vanishing initial expectation values.

The paper clarifies the applicability of weak values in quantum systems.

Abstract

Svensson [Found. Phys. 45, 1645 (2015)] argued that the concept of the weak value of an observable of a pre- and post-selected quantum system cannot be applied when the expectation value of the observable in the initial state vanishes. Svensson's argument is analyzed and shown to be inconsistent using several examples.