  A long standing obstacle to realizing highly sought on-chip monolithic solid
state quantum optical circuits has been the lack of a starting platform
comprising buried (protected) scalable spatially ordered and spectrally uniform
arrays of on-demand single photon sources (SPSs). In this paper we report the
first realization of such SPS arrays based upon a class of single quantum dots
(SQDs) with single photon emission purity > 99.5% and uniformity < 2nm. Such
SQD synthesis approach offers rich flexibility in material combinations and
thus can cover the emission wavelength regime from long- to mid- to
near-infrared to the visible and ultraviolet. The buried array of SQDs
naturally lend themselves to the fabrication of quantum optical circuits
employing either the well-developed photonic 2D crystal platform or the use of
Mie-like collective resonance of all-dielectric building block based
metastructures designed for directed emission and manipulation of the emitted
photons in the horizontal planar architecture inherent to on-chip optical
circuits. Finite element method-based simulations of the Mie-resonance based
manipulation of the emitted light are presented showing achievement of
simultaneous multifunctional manipulation of photons with large spectral
bandwidth of ~ 20nm that eases spectral and mode matching. Our combined
experimental and simulation findings presented here open the pathway for
fabrication and study of on-chip quantum optical circuits.
