Dissipative stabilization of maximal entanglement between non-identical emitters via two-photon excitation

TL;DR

This paper explores how two non-identical quantum emitters can achieve near-maximal entanglement through two-photon excitation and cavity effects, revealing complex phenomena and potential for optical detection.

Contribution

It provides a detailed analysis of two-photon resonance stabilization of entanglement in non-identical emitters, expanding understanding of cavity-mediated quantum state control.

Findings

Resonant cavity frequencies stabilize sub- and superradiant states.

Mechanisms generate stationary and metastable entanglement.

Analytical insights connect to previous literature and optical detection methods.

Abstract

Two non-identical quantum emitters, when placed within a cavity and coherently excited at the two-photon resonance, can reach stationary states of nearly maximal entanglement. In Vivas-Via\~na et al., we introduce a frequency-resolved Purcell effect stabilizing entangled $W$ states among strongly interacting quantum emitters embedded in a cavity. Here, we delve deeper into a specific configuration with a particularly rich phenomenology: two interacting quantum emitters under coherent excitation at the two-photon resonance. This scenario yields two resonant cavity frequencies where the combination of two-photon driving and Purcell-enhanced decay stabilizes the system into the sub- and superradiant states, respectively. By considering the case of non-degenerate emitters and exploring the parameter space of the system, we show that this mechanism is merely one among a complex family of phenomena that can generate both stationary and metastable entanglement when driving the emitters at the two-photon resonance. We provide a global perspective of this landscape of mechanisms and contribute analytical characterizations and insights into these phenomena, establishing connections with previous reports in the literature and discussing how some of these effects can be optically detected.