Entanglement Entropy of Nontrivial States

TL;DR

This paper investigates the entanglement entropy of specific quantum states, demonstrating a method to obtain finite entropy values by subtracting the vacuum entropy, applicable when the unobserved region remains consistent.

Contribution

It introduces a way to define finite entanglement entropy for coherent and one-particle states through vacuum subtraction, addressing divergence issues.

Findings

Finite entanglement entropy can be obtained by subtracting vacuum entropy.

Applicable to coherent and one-particle states.

Method ensures consistent unobserved regions.

Abstract

We study the entanglement entropy arising from coherent states and one--particle states. We show that it is possible to define a finite entanglement entropy by subtracting the vacuum entropy from that of the considered states, when the unobserved region is the same.