On-Chip Integrated Single Photon Source-Optically Resonant Metastructure Based Scalable Quantum Optical Circuits

We present an approach to realizing on-chip optical quantum information processing (QIP) systems comprising (1) single photon source (SPS) arrays, here based on a new class of ordered single quantum dots of controlled size and shape named Mesa-top Single Quantum Dots (MTSQDs) that are naturally integrable in scalable architectures with (2) on-chip light manipulating units (LMUs) based upon either the conventional 2D photonic crystal platform or metastructures made of subwavelength size dielectric building blocks (DBBs) whose collective Mielike optical resonances provide, simultaneously, all the needed light manipulating functions. The MTSQDs can provide high spectral uniformity with as-grown pairs emitting within 300μeV -thus calling for exploration of pathways for implementing onchip SPS-SPS coupling for quantum entanglement. To this end, we present here simulation results for two different DBB-based implementations of scalable photon entanglement in MTSQDDBB LMU coupled system.: (1) DBB array based nanoantenna-wave guide-beamsplitter-beam combiner meta-structures around the MTSQD SPSs that exploit primarily their collective magnetic dipole mode to simultaneously provide Purcell enhancement, enhanced emission directionality, waveguiding, beamspliting and beamcombining, thus enabling on-chip path entanglement via indirect coupling between the SPSs; (2) two MTSQDs coupled directly via the collective magnetic dipole mode of a back-to-back nanoantenna-wave guide structure. In either case, the long-distance coupled MTSQD-DBB structural units constitute the primitives for building complex quantum optical circuits.