Dynamics of mode entanglement in a system of cavities coupled with a chiral mirror

TL;DR

This paper explores how mode entanglement evolves in a system of two optical cavities coupled via a chiral mirror, analyzing both Hermitian and non-Hermitian dynamics and their impact on quantum correlations.

Contribution

It introduces a detailed analysis of mode entanglement dynamics in coupled cavities with non-reciprocal interactions using non-Hermitian quantum evolution methods.

Findings

Non-conservation of mean spin in non-reciprocal coupling cases

Robust quantum entanglement can be achieved through non-reciprocal coupling

Spin noise varies with initial states and coupling symmetry

Abstract

We investigate the Hermitian and the non-Hermitian dynamics of the mode entanglement in two identical optical cavities coupled by a chiral mirror. By employing the non-Hermitian quantum evolution, we calculate the logarithmic negativity measure of entanglement for initially Fock, coherent and squeezed states, separately. We verify the non-conservation of mean spin for the initially coherent and squeezed states when the coupling is non-reciprocal and report the associated spin noise for each case. We examine the effects of non-conserved symmetries on the mode correlations and determine the degree of non-reciprocal coupling to establish robust quantum entanglement.