Comment on "Quantification of Macroscopic Quantum Superpositions within Phase Space"

TL;DR

This paper analyzes a phase space measure for quantum superpositions, showing its relation to existing measures and discussing its properties for pure and mixed states.

Contribution

It clarifies the relationship between Lee and Jeong's phase space measure and established measures, providing insights into its application to pure and mixed states.

Findings

The measure is equivalent to an existing measure for pure states.

For mixed states, the paper discusses the measure's properties and implications.

The measure's relation to well-studied measures enhances understanding of quantum superpositions.

Abstract

The phase space measure proposed by Lee and Jeong [PRL 106, 220401 (2011)] is shown to be closely related to a well-studied measure in the literature. For pure states, the newly proposed measure is equivalent to an old measure; for mixed states, some discussions are given.