  We show that it is possible to generate photons in nonclassical states from a
metal-dielectric interface using quantum emitters on the interface. The photons
emitted into the surface plasmon mode from the initially excited emitters
radiate out in free space in a cone-shaped geometry. When detected at two
detectors, these photons exhibit anti-coalescence, a clear signature of
nonclassicality. Such a system can also be employed as a building block for a
distributed quantum network. We further show that it is indeed feasible to
implement our model using available technology.
