Spin squeezing, entanglement and coherence in two driven, dissipative, nonlinear cavities coupled with single and two-photon exchange

TL;DR

This paper explores how quantum properties like spin squeezing, entanglement, and coherence behave in two coupled nonlinear cavities under different photon exchange processes and driving conditions, revealing regimes of distinct quantum correlations.

Contribution

It provides a comparative analysis of quantum statistical properties in coupled cavities with single and two-photon exchange, highlighting the influence of exchange strength and driving on quantum regimes.

Findings

Identification of regimes with distinct quantum statistical properties

Demonstration of the impact of photon exchange type on entanglement and coherence

Analysis of drive strength effects on quantum correlations

Abstract

We investigate spin squeezing, quantum entanglement and second order coherence in two coupled, driven, dissipative, nonlinear cavities. We compare these quantum statistical properties for the cavities coupled with either single or two-photon exchange. Solving the quantum optical master equation of the system numerically in the steady state, we calculate the zero-time delay second-order correlation function for the coherence, genuine two-mode entanglement parameter, and an optimal spin squeezing inequality associated with particle entanglement. We identify regimes of distinct quantum statistical character depending on the relative strength of photon-exchange and nonlinearity. Moreover, we examine the effects of weak and strong drives on these quantum statistical regimes.