Entanglement assisted via Kerr effect in exciton-optomechanics

Abstract Entanglement lies at the core of numerous quantum information processing applications. A main obstacle against implementing powerful quantum information tasks is decoherence that degrades, or even destroys, entanglement. Therefore, developing strategies to mitigate decoherence is essential for practical implementations. Here, we propose a scheme to enhance exciton-exciton entanglement in an exciton-optomechanical cavity incorporating a Kerr medium. Under experimentally feasible conditions, we demonstrate that the Kerr nonlinearity not only strengthens excitonic entanglement, but also allows it to persist over a wide range of operating parameters. While strong exciton-phonon coupling is required for entangling the two excitonic modes in the Kerr medium-free case, we show that such coupling is no longer necessary when the Kerr interaction is introduced. Remarkably, the presence of the Kerr medium enables the excitonic entanglement to survive up to room temperature without requiring a very high mechanical quality factor. Our scheme provides a promising route for generating robust entanglement and may open new possibilities for quantum information applications.