不同抗磁行为量子点发光在波导中的手性传输

Chiral optical transport of quantum dots with different diamagnetic behaviors in a waveguide

近年来,为了实现可拓展的集成化量子网络,各种功能性量子器件的发展需求不断加深.集成了单量子点的条形波导可以作为单向传输的量子点光源,在单光子二极管、晶体管和确定性量子门等器件中具有广泛的应用.本文利用共聚焦显微系统,在4.2 K低温下,通过激发波导中心区域的量子点光源,实现了圆极化光的分离,并验证了波导中的自旋动量锁定效应.在实验中实现了具有反常抗磁行为的量子点荧光的手性传输,拓宽了波导单向传输的波长调控范围.在保证波导单向传输性的同时,实现了不同输出光子中心能量的正向、反向偏移.本文为研究宽波段范围的手性量子器件奠定了基础,拓展了波导在量子信息领域中的应用.

In order to realize scalable and integrated quantum photonic networks,various functional devices are highly desired.Strip waveguides with unidirectional transmission function have a wide range of applications in devices such as single-photon diodes,transistors and deterministic quantum gate devices.In this work,the separation of circularly polarized light is achieved by exciting a quantum dot light source in a central region of a waveguide at a low temperature of 4.2 K by using a confocal microscope system.By applying a magnetic field with Faraday configuration(along with the quantum dot growth direction),the spin-momentum locking effect in the waveguide is verified.Both forward shift and reverse shift of different values of output photon energy are demonstrated to show the unidirectional transmission of the waveguide.The chiral transmission of quantum dot with anomalous diamagnetic behavior is achieved in experiment,leading to a wider range of wavelength tuning for chrial transmission in a single waveguide.This paper provides a basis for investigating the chiral quantum devices in a wide wavelength range and expands the applications of waveguides in the field of optical quantum information.