Topological reflected entropy in Chern-Simons theories

TL;DR

This paper investigates the reflected entropy in 2+1D Chern-Simons theories, demonstrating its equivalence to mutual information and exploring its holographic duals, using edge theory and surgery methods.

Contribution

It introduces a novel computation of reflected entropy in Chern-Simons theories and establishes its relation to mutual information and holographic entanglement measures.

Findings

Reflected entropy equals mutual information in studied cases.

Both reflected and odd entropy have holographic duals as entanglement wedge cross-sections.

Reflected and odd entropy relate similarly to holographic duals as in 2D CFTs, with a classical Shannon correction.

Abstract

We study the reflected entropy between two spatial regions in $(2+1)$-dimensional Chern-Simons theories. Taking advantage of its replica trick formulation, the reflected entropy is computed using the edge theory approach and the surgery method. Both approaches yield identical results. In all cases considered in this paper, we find that the reflected entropy coincides with the mutual information, even though their R\'enyi versions differ in general. We also compute the odd entropy with the edge theory method. The reflected entropy and the odd entropy both possess a simple holographic dual interpretation in terms of entanglement wedge cross-section. We show that in $(2+1)$-dimensional Chern-Simons theories, both quantities are related in a similar manner as in two-dimensional holographic conformal field theories (CFTs), up to a classical Shannon piece.