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Physical Review A

Room-temperature exciton-vibration-photon entanglement in polariton optomechanics

Jian Huang, Zhedong Zhang

Published Jun 17, 2025• 5 citations
Publisher

Abstract

Room-temperature quantum entanglement not only is significant for the advancement of quantum physics but also has broad application prospects in quantum technology. Here we investigate the generation of room-temperature quantum entanglement in a polariton optomechanical system consisting of an optical mode, a molecular vibrational mode, and N excitonic modes. The excitons and vibration are coupled via conditional displacement interactions, while the photon-exciton couplings occur via electric dipole interactions. We find that, mediated by exciton-vibration interaction, strong entanglement is established between the photon and the exciton, as well as between the photon and the vibration. Notably, the photon-vibration entanglement exhibits an astonishing enhancement with an increasing number of excitons, even far surpassing the entanglement generated from direct coupling between the exciton and vibration. Moreover, we demonstrate that these entanglements not only can be generated in a room-temperature environment (T = 300 K) but also exhibit considerable robustness against thermal noise. Furthermore, we achieve tripartite entanglement in this system under both room- and ultrahigh-temperature conditions. The increase in the number of excitons can significantly improve the tolerance of tripartite entanglement to thermal noise and optical dissipation. Our results indicate that polariton optomechanical systems could provide a promising platform for generating room-temperature and high-temperature-resistant entangled quantum resources, which are crucial for practical quantum technologies. ©2025 American Physical Society

DOI
10.1103/2dfx-23qp

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Quantum entanglement stands as an intriguing and pivotal phenomenon in quantum mechanics, forming the cornerstone for the realization of technologies transcending classical boundaries and enabling the practical deployment of diverse quantum devices. Here, we propose a method to manipulate both the pairwise entanglement among exciton-photon, exciton-phonon, and photon-phonon modes, and the tripartite entanglement involving exciton, photon, and phonon modes, within a hybrid exciton-optomechanics system, utilizing two pump lasers propagating in different directions. We find that all three distinct types of bipartite quantum entanglement and the tripartite entanglement can be effectively controlled and even enhanced along with improved robustness against environmental thermal noise by properly adjusting the phase difference between the two pump lasers. Our findings open up an easily accessible method for manipulating and protecting quantum entanglement, which is crucial in a wide range of practical applications requiring purely quantum resources, such as noise-tolerant quantum processing and quantum precision measurements. © 2026 American Physical Society
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We study nonreciprocal bipartite and tripartite entanglement in a spinning exciton-optomechanical system (EOMS) with an optical parametric amplifier (OPA). We demonstrate that nonreciprocal entanglement among photons, excitons, and phonons can be achieved under experimentally feasible parameters. We find that the nonreciprocal entanglement induced by Sagnac effects can be regulated through the OPA. Particularly, We show that the OPA significantly enhances photon-exciton entanglement and tripartite entanglement but weakens photon-phonon and exciton-phonon entanglement. Moreover, we find that the photon-exciton nonreciprocal entanglement not only can be generated at room temperature and even higher temperature but also exhibits highly robustness to cavity dissipation. Our works open a way to manipulate the room-temperature nonreciprocal entanglement, which may be useful for developing nonreciprocal quantum technologies.
We propose a scheme for generating genuinely tripartite entanglements in microcavity exciton polaritons comprised of an exciton, photon, and phonon modes. We search for robust stationary bipartite and tripartite entanglements by optimizing optomechanical parameters while revealing the mechanism for generating entangled states by non-Hermitian spectrum. Maximum photon-phonon and exciton-phonon bipartite entanglements appear at the cross points of real eigenvalues in the non-Hermitian spectrum, while photon-exciton bipartite entanglements and tripartite entanglements are related to the breaking of parity-time symmetry. We also demonstrate entanglement dynamics and discover entanglement oscillations, transformation, and sudden death. Entanglement transformation among different bipartite entanglements and entanglement sudden death can be effectively regulated by cavity-exciton detunings and exciton-photon-phonon couplings. Moreover, thermal noises should be degraded to generate robust stationary entanglements and maintain prolonged dynamical entanglements. Our results open up new possibilities for constructing exciton-photon-phonon tripartite entanglements, which may have potential applications in developing quantum computing and quantum information processing protocols based on macroscopic entangled states.
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 JmJ_mJm​ 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.
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.