Nanodot-cavity electrodynamics and photon entanglement

Abstract

A theory of an integrable solid-state quantum controlled-phase gate for generating entanglement of two photons using a coupled nanodot-microcavity-fiber structure was presented. It was observed that a conditional phase shift of O (π/10) was calculated to be the consequence of the giant optical nonlinearity keyed by the excitons in the cavities. It was shown that the structural design and active control, like electromagnetically induced transparency and pulse shaping, optimize the quantum efficiency of the gate operation. The input state was prepared as the equal linear combination of the four polarization states of the two photons.