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We propose a scheme to modulate the entanglement between two oscillatorsseparated in space via the squeezing cavity field generated by the opticalparametric amplifier instead of injecting the squeezing field directly with theassistance of Coulomb interaction. We show that the Coulomb interaction betweenthe oscillators is the essential reason for the existence of entanglement. Dueto the gain of the optical parametric amplifier and the phase of the pumpdriving the optical parametric amplifier can simultaneously modulate thesqueezing cavity field, the radiation pressure interaction between the cavityfield and the oscillator is modulated accordingly. We find that there iscompeting effect between the radiation pressure interaction and the Coulombinteraction for the oscillator which these two interactions act onsimultaneously. Therefore, the modulation of entanglement can be achieved withthe assistance of Coulomb interaction. The results of numerical simulation showthat the present scheme has stronger robustness against the temperature ofenvironment compared with previous schemes in experimentally feasible regimes.

Modulation of entanglement between two oscillators separated in space with an optical parametric amplifier