用于片上可扩展量子光路的光谱超均匀单量子点的掩埋空间规则阵列
Buried spatially-regular array of spectrally ultra-uniform single quantum dots for on-chip scalable quantum optical circuits
摘要：
实现高度寻求的片上单片固态量子光学电路的长期障碍是缺乏包括按需单光子源（SPS）的掩埋（受保护）可扩展空间有序和光谱均匀阵列的起始平台。本文报道了基于单光子发射纯度> 99.5%、均匀性< 2nm的单量子点的SPS阵列的首次实现。这种SQD合成方法在材料组合中提供了丰富的灵活性，因此可以覆盖从长红外到中红外到近红外到可见光和紫外线的发射波长范围。SQD的掩埋阵列自然地适合于量子光学电路的制造，该量子光学电路采用良好开发的光子2D晶体平台或使用基于全电介质构建块的元结构的类米氏集体共振，该元结构被设计用于在片上光学电路固有的水平平面架构中定向发射和操纵所发射的光子。基于有限元方法的模拟的Mie共振的发射光的操纵，示出了实现的同时多功能的光子操纵与大的光谱带宽为~ 20 nm，简化光谱和模式匹配。我们的实验和模拟结果相结合，在这里提出的芯片上量子光路的制造和研究开辟了道路。
英文摘要：
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.
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