Optimizing mechanical entanglement using squeezing and parametric amplification

We propose a scheme of an optomechanical system that optimizes entanglement in nanomechanical resonators through quantum state transfer of intracavity squeezing and squeezed reservoir field sources assisted by radiation pressure. The system is driven by red-detuned laser fields, which enable simultaneous cooling of the mechanical resonators and facilitate the quantum state transfer in a weak coupling and good cavity limit. Specifically, the mechanical entanglement is quantified using logarithmic negativity within the bipartite Gaussian states of the two mechanical modes. The results show that several key parameters, including the parametric phase and nonlinear gain of the non-degenerate optical parametric amplifier, the strength of the squeezing reservoir, optomechanical cooperativity, thermal excitation of phonons, and the temperature of mechanical baths, strongly influence the degree of mechanical entanglement. Hence, the findings indicate that careful tuning of the parameters can enable control over the enhancement of entanglement robustness, suggesting that this optomechanical scheme provides a viable pathway for applications in quantum sensing and information processing • An optomechanical scheme enhances entanglement via squeezing and red-detuned driving. • Entanglement is quantified using logarithmic negativity from the covariance matrix. • Key parameters: squeezing strength, phase, gain, cooperativity, and bath temperature. • Coupling to a two-mode squeezed vacuum boosts robustness to mechanical thermal noise. • The scheme offers a viable platform for quantum metrology and information processing.