On-chip Integrable Highly Spectrally Uniform Ordered Semiconductor Quantum Dot Single Photon Source Arrays for Scalable Quantum Optical Networks

Abstract

Scalable optical networks demand ordered and spectrally uniform single photon source (SPS) array integrable on-chip with photon manipulating units. Recently we demonstrated such SPSs based on a new class of spatially ordered and spectrally uniform InGaAs/GaAs mesa top single quantum dots (MTSQDs) [1,2] that are readily integrable, on-chip, with dielectric light manipulating units (LMUs) [1,3] based on 2D photonic crystal platform or collective Mie-like resonance of dielectric building block based metastructures. These MTSQDs have single photon emission purity > 99% (g(2)(0)<0.02) at 9.4K [2]. The spectral uniformity of the nominally In0.5Ga0.5As MTSQD array is ~8nm limited by alloy fluctuation, but importantly reveal pairs of MTSQDs emitting within 300μeV [1,3]. In this talk we report studies on binary InAs/GaAs MTSQD in 5X8 arrays demonstrating striking spectral uniformity of 1.8nm (<2meV) over 1000um2 area. The results highlight the potential of the spatially-ordered MTSQDs-LMU integrated system for realizing quantum optical circuits [3]. [1] J.Zhang et.al,J.Appl.Phys.120,243103(2016) [2] J.Zhang et.al,Appl.Phys.Lett.114,071102(2019) [3] S.Chattaraj et.al,IEEE J.Quant.Electron(2019), accepted for publication