Coherently triggered single photons from a quantum-dot cavity system

Abstract

We present a scheme to realize a highly efficient solid state source of indistinguishable single photons using cavity-assisted stimulated adiabatic Raman passage in a single quantum dot. The Autler-Townes doublet, generated by using a resonant driving field between biexciton and exciton states is utilized to facilitate a two-photon Raman transition in the quantum dot. An optical field transient then coherently generates a single photon pulse, whose polarization is orthogonal to the polarization of the applied fields and can thus be filtered efficiently from the scattered fields. The triggered generated single photons have greater than 90% efficiency and more than 90% quantum indistinguishability using currently available experimental parameters.