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arXiv · 2505.21227

Strong Molecule-Light Entanglement with Molecular Cavity Optomechanics

Hong-Yun Yu·Ya-Feng Jiao·Jie Wang·Feng Li·Bin Yin·Tian Jiang·Qi-Rui Liu·Hui Jing·Ke Wei
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Abstract

We propose a molecular optomechanical platform to generate robust entanglement among bosonic modes-photons, phonons, and plasmons-under ambient conditions. The system integrates an ultrahigh-Q whispering-gallery-mode (WGM) optical resonator with a plasmonic nanocavity formed by a metallic nanoparticle and a single molecule. This hybrid architecture offers two critical advantages over standalone plasmonic systems: (i) Efficient redirection of Stokes photons from the lossy plasmonic mode into the long-lived WGM resonator, and (ii) Suppression of molecular absorption and approaching vibrational ground states via plasmon-WGM interactions. These features enable entanglement to transfer from the fragile plasmon-phonon subsystem to a photon-phonon bipartition in the blue-detuned regime, yielding robust stationary entanglement resilient to environmental noise. Remarkably, the achieved entanglement surpasses the theoretical bound for conventional two-mode squeezing in certain parameter regimes. Our scheme establishes a universal approach to safeguard entanglement in open quantum systems and opens avenues for noise-resilient quantum information technologies.

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Hong-Yun Yu, Ya-Feng Jiao, Jie Wang, Feng Li, Bin Yin, Tian Jiang, Qi-Rui Liu, Hui Jing, Ke Wei. 2025-05-27. Strong Molecule-Light Entanglement with Molecular Cavity Optomechanics. https://arxiv.org/abs/2505.21227

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