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H. Rudolph, K. Hornberger, and B. A. Stickler
Entangling levitated nanoparticles by coherent scattering
Phys. Rev. A 101, 011804(R) (2020)


We show how entanglement between two optically levitated nanoparticles can be generated and detected by coherent scattering of tweezer photons into a single cavity mode. Triggered by the detection of a Stokes photon, the tweezer detuning is switched from the blue to the red; entanglement is then verified by the conditioned anti-Stokes photon flux, which oscillates with the mechanical beat frequency. The proposed setup is realizable with near-future technology and opens the door to experimental observation of nonclassical center-of-mass correlations between two or more levitated nanoscale objects.

(5 pages, 6 figures)   [pdf, journal, arXiv:2001.05769]

doi:10.1103/PhysRevA.101.011804            (c) The American Physical Society