Quantum entanglement enhanced via dark mode control in molecular optomechanics

TL;DR

This paper proposes a molecular cavity optomechanical scheme that enhances quantum entanglement by controlling dark mode effects, enabling more robust and tunable quantum correlations for advanced quantum technologies.

Contribution

It introduces a method to break dark modes via phase modulation of intermolecular coupling, significantly boosting entanglement and thermal robustness in molecular optomechanical systems.

Findings

Entanglement is greatly enhanced in the dark-mode-broken regime.

The scheme allows flexible switching between dark mode regimes.

Enhanced entanglement shows increased resilience to thermal noise.

Abstract

Quantum entanglement is an interesting resource for modern quantum technologies, where generating multiple quantum entanglement is highly required. However, entanglement engineering between multiple modes is strongly suppressed by dark mode effect. Here, we proposed a scheme based on molecular cavity optomechanical structure that enhances quantum bipartite and tripartite entanglement via dark mode breaking. Our proposal consists of an optical cavity that hosts two molecular ensembles which are coupled through an intermolecular coupling. A vibrational hopping rate $J_m$ captures the intermolecular coupling that is phase modulated via the synthetic gauge field method. The breaking of the dark mode is controlled by tuning both the intermolecular coupling and its modulation phase. By adjusting these parameters in our proposal, we can flexibly switch between the Dark Mode Unbroken (DMU) and the Dark Mode Broken (DMB) regimes. We find that in the dark-mode-unbroken regime, the amount of the generated bipartite and tripartite entanglement is significantly low or is suppressed. In contrast, in the dark-mode-broken regime, the entanglement is greatly enhanced,i.e., up to twofold enhancement. Moreover, the generated entanglement is more resilient against thermal noise in the dark-mode-broken regime compared to the thermal robustness in the unbroken regime. Therefore, our proposed scheme serves as a benckmark system to improve quantum correlations engineering, and to generate noise-tolerant quantum resources for applications in numerous modern quantum technologies.