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Entanglement generation at a macroscopic scale offers an exciting avenue todevelop new quantum technologies and study fundamental physics on a tabletop.Cavity quantum optomechanics provides an ideal platform to generate and exploitsuch phenomena owing to the precision of quantum optics combined with recentexperimental advances in optomechanical devices. In this work, we proposeschemes operating outside the resolved-sideband regime, to prepare and verifyboth optical-mechanical and mechanical-mechanical entanglement. Our schemesemploy pulsed interactions with a duration much less than the mechanical periodand, together with homodyne measurements, can both generate and characterizethese types of entanglement. To improve the performance of our schemes, aprecooling stage comprising prior pulses can be utilized to increase the amountof entanglement prepared, and local optical squeezers may be used to provideresilience against open-system dynamics. The entanglement generated by ourschemes is quantified using the logarithmic negativity and is analysed withrespect to the strength of the pulsed optomechanical interactions for realisticexperimental scenarios including mechanical decoherence and optical loss. Twoseparate schemes for mechanical entanglement generation are introduced andcompared: one scheme based on an optical interferometric design, and the othercomprising sequential optomechanical interactions. The pulsed nature of ourprotocols provides more direct access to these quantum correlations in the timedomain, with applications including quantum metrology and tests of quantumdecoherence. By considering a parameter set based on recent experiments, thefeasibility to generate significant entanglement with our schemes, even withlarge optical losses, is demonstrated.

Generating mechanical and optomechanical entanglement via pulsed interaction and measurement