Phase-controlled robust quantum entanglement in exciton optomechanics

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