Graphene as a source of entangled plasmons

  title={Graphene as a source of entangled plasmons},
  author={Zhiyuan Sun and Dmitri N. Basov and Michael M. Fogler},
  journal={Physical Review Research},
We analyze nonlinear optics schemes for generating pairs of quantum entangled plasmons in the terahertz-infrared range in graphene. We predict that high plasmonic field concentration and strong optical nonlinearity of monolayer graphene enables pair-generation rates much higher than those of conventional photonic sources. The first scheme we study is spontaneous parametric down conversion in a graphene nanoribbon. In this second-order nonlinear process a plasmon excited by an external pump splits… 
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