Strong Molecule-Light Entanglement with Molecular Cavity Optomechanics

TL;DR

This paper introduces a hybrid molecular optomechanical system that generates robust, noise-resistant entanglement among photons, phonons, and plasmons at room temperature, advancing quantum information processing capabilities.

Contribution

It proposes a novel hybrid cavity system combining whispering-gallery-mode resonators with plasmonic nanocavities to enhance and protect entanglement in open quantum systems.

Findings

Achieved entanglement surpassing two-mode squeezing bounds.

Demonstrated robustness of entanglement under environmental noise.

Enabled efficient transfer of entanglement to photon-phonon bipartitions.

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.