Robust entanglement of a micromechanical resonator with output optical fields

Genes, C.; Mari, A.; Tombesi, P.; Vitali, D.

doi:10.1103/PhysRevA.78.032316

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Robust entanglement of a micromechanical resonator with output optical fields

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Genes, C., Mari, A., Tombesi, P., & Vitali, D. (2008). Robust entanglement of a micromechanical resonator with output optical fields. PHYSICAL REVIEW A, 78(3): 032316. doi:10.1103/PhysRevA.78.032316.

Cite as: https://hdl.handle.net/21.11116/0000-0001-D8C8-A

Abstract

We perform an analysis of the optomechanical entanglement between the experimentally detectable output field of an optical cavity and a vibrating cavity end-mirror. We show that by a proper choice of the readout (mainly by a proper choice of detection bandwidth) one cannot only detect the already predicted intracavity entanglement but also optimize and increase it. This entanglement is explained as being generated by a scattering process owing to which strong quantum correlations between the mirror and the optical Stokes sideband are created. All-optical entanglement between scattered sidebands is also predicted, and it is shown that the mechanical resonator and the two sideband modes form a fully tripartite-entangled system capable of providing practicable and robust solutions for continuous-variable quantum-communication protocols.