Comment on "Fermionic entanglement ambiguity in noninertial frames"

TL;DR

This paper clarifies that the ambiguity in fermionic entanglement calculations under the Unruh effect stems from mathematical errors and superselection rules, not from the intrinsic properties of fermionic fields.

Contribution

It corrects previous claims by showing the source of entanglement ambiguity is due to mathematical mistakes and superselection rules, not fermionic field properties.

Findings

Ambiguity arises from mathematical errors, not fermionic properties.

Superselection rules are crucial in fermionic entanglement calculations.

Corrected calculations remove the perceived ambiguity.

Abstract

In this comment we show that the ambiguity of entropic quantities calculated in Physical Review A 83, 062323 (2011) for fermionic fields in the context of Unruh effect is not related to the properties of anticommuting fields, as claimed in Physical Review A 83, 062323 (2011), but rather to wrong mathematical manipulations with them and not taking into account a fundamental superselection rule of quantum field theory.