Plasmonic Nanoantennas for Efficient Control of Polarization-Entangled   Photon Pairs
  We suggest a novel source of polarization-entangled photon pairs based on a cross-shaped plasmonic nanoantenna driven by a single quantum dot. The integration of the nanoantenna with a metal mirror overcomes the fundamental tradeoff between the spontaneous emission (SE) enhancement and the extraction efficiency typical of microcavity and nanowire-based architectures. With a very-high extraction efficiency of entangled photons (~90%) at 1.55 um and large SE enhancement (~90) over a broad 330 nm spectral range, the proposed design will pave the way toward reliable integrated sources of nonclassical light. 
Ivan S. Maksymov, Andrey E. Miroshnichenko, and Yuri S. Kivshar
physics.optics quant-ph