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Science China(Physics,Mechanics & Astronomy) 2024年第9期67卷 99-107页

作者： Beimeng Yao Rongbin Su Shunfa Liu changkun song Ying Yu Jin Liu Xuehua Wang State Key Laboratory of Optoelectronic Materials and Technologies School of PhysicsSun Yat-sen UniversityGuangzhou 510275China State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information TechnologySun Yat-sen UniversityGuangzhou 510275China

Recent advancements in quantum photonic circuits have significantly influenced the field of quantum information *** pursuit of an integrated quantum photonic circuit that offers an active,stable platform for large-scale integration and high processing efficiency remains a key *** grating coupler,as a crucial element for an efficient transformation output interface in the integrated quantum photonic circuits,presents significant potential for practical ***,we demonstrate the integration block of a highly efficient shallow-etched focusing apodized grating coupler with indium arsenide(InAs)quantum dots(QDs)in gallium arsenide(GaAs)on a SiO2substrate for active quantum photonic *** designed grating couplers possess a high efficiency over 90% in the broadband(900-930 nm)from the circuit to free space,and a nearly-perfect match with the fiber ***,the efficiency to free space reaches 81.8%,and the match degree with the fiber mode is high up to 92.1%.The proposed integration block offers the potential for large-scale integration of active quantum photonic circuits due to its stable solid substrate and highly performant output for quantum measurements.

关键词： quantum dot grating coupler wafer bonding quantum photonic circuit

Single photon emitter deterministically coupled to a topological corner state

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Light(Science & Applications) 2024年第1期13卷 135-141页

作者： Mujie Rao Fulong Shi Zhixuan Rao Jiawei Yang changkun song Xiaodong Chen Jianwen Dong Ying Yu Siyuan Yu State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information TechnologySchool of PhysicsSun Yat-Sen UniversityGuangzhou 510006China Hefei National Laboratory Hefei 230088China

Incorporating topological physics into the realm of quantum photonics holds the promise of developing quantum light emitters with inherent topological robustness and immunity to ***,the deterministic interaction of quantum emitters with topologically nontrivial resonances remains largely *** we present a single photon emitter that utilizes a single semiconductor quantum dot,deterministically coupled to a second-order topological corner state in a photonic crystal *** investigating the Purcell enhancement of both single photon count and emission rate within this topological cavity,we achieve an experimental Purcell factor of Fp=***,we demonstrate the on-demand emission of polarized single photons,with a second-order autocorrelation function g(2)(0)as low as 0.024±*** approach facilitates the customization of light-matter interactions in topologically nontrivial environments,thereby offering promising applications in the field of quantum photonics.

关键词： topological quantum deterministic

Inter-facet composition modulation of III-nitride nanowires over pyramid textured Si substrates by stationary molecular beam epitaxy

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Nano Research 2021年第5期14卷 1502-1511页

作者： Peng Wang Hedong Chen Hao Wang Dan Wang changkun song Xingyu Wang Hongjie Yin Lujia Rao Guofu Zhou Richard Nötzel Guangdong Provincial Key Laboratory of Optical Information Materials and Technology South China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou510006China National Center for International Research on Green Optoelectronics South China Normal UniversityGuangzhou510006China Department of Physics Xiamen UniversityXiamen361005China Analysis&Testing Center South China Normal UniversityGuangzhou510631China Academy of Shenzhen Guohua Optoelectronics Shenzhen518110China

InGaN nanowires (NWs) are grown on pyramid textured Si substrates by stationary plasma-assisted molecular beam epitaxy (PA-MBE). The incidence angles of the highly directional source beams vary for different pyramid facets, inducing a distinct inter-facet modulation of the In content of the InGaN NWs, which is verified by spatial element distribution analysis. The resulting multi-wavelength emission is confirmed by photoluminescence (PL) and cathodoluminescence (CL). Pure GaN phase formation dominates on certain facets, which is attributed to extreme local growth conditions, such as low active N flux. On the same facets, InGaN NWs exhibit a morphology change close to the pyramid ridge, indicating inter-facet atom migration. This cross-talk effect due to inter-facet atom migration is verified by a decrease of the inter-facet In content modulation amplitude with shrinking pyramid size. A detailed analysis of the In content variation across individual pyramid facets and element distribution line profiles reveals that the cross-talk effect originates mainly from the inter-facet atom migration over the convex pyramid ridge facet boundaries rather than the concave base line facet boundaries. This is understood by first-principles calculations showing that the pyramid baseline facet boundary acts as an energy barrier for atom migration, which is much higher than that of the ridge facet boundary. The influence of the growth temperature on the inter-facet In content modulation is also presented. This work gives deep insight into the composition modulation for the realization of multi-color light-emitting devices based on the monolithic growth of InGaN NWs on pyramid textured Si substrates.

关键词： pyramid textured Si substrate composition modulation III-nitride nanowire molecular beam epitaxy stationary growth cross talk

Tunable quantum dots in monolithic Fabry-Perot microcavities for high-performance single-photon sources

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Light(Science & Applications) 2024年第2期13卷 325-332页

作者： Jiawei Yang Yan Chen Zhixuan Rao Ziyang Zheng changkun song Yujie Chen Kaili Xiong Pingxing Chen Chaofan Zhang Wei Wu Ying Yu Siyuan Yu State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information TechnologySun Yat-Sen UniversityGuangzhou 510006China Institute for Quantum Science and Technology College of ScienceNational University of Defense TechnologyChangsha 410073China College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China Hunan Key Laboratory of Quantum Information Mechanism and Technology National University of Defense TechnologyChangsha 410073 HunanChina Hefei National Laboratory Hefei 230088China

Cavity-enhanced single quantum dots(QDs)are the main approach towards ultra-high-performance solid-state quantum light sources for scalable photonic quantum ***,harnessing the Purcell effect requires precise spectral and spatial alignment of the QDs’emission with the cavity mode,which is challenging for most *** we have successfully integrated miniaturized Fabry-Perot microcavities with a piezoelectric actuator,and demonstrated a bright single-photon source derived from a deterministically coupled QD within this *** the cavity-membrane structures,we have achieved large spectral tunability via strain *** resonance,a high Purcell factor of~9 is *** source delivers single photons with simultaneous high extraction efficiency of 0.58,high purity of 0.956(2)and high indistinguishability of 0.922(4).Together with its compact footprint,our scheme facilitates the scalable integration of indistinguishable quantum light sources on-chip,therefore removing a major barrier to the development of solid-state quantum information platforms based on QDs.

关键词： quantum removing purity

Bright semiconductor single-photon sources pumped by heterogeneously integrated micropillar lasers with electrical injections

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Light(Science & Applications) 2023年第3期12卷 489-496页

作者： Xueshi Li Shunfa Liu Yuming Wei Jiantao Ma changkun song Ying Yu Rongbin Su Wei Geng Haiqiao Ni Hanqing Liu Xiangbin Su Zhichuan Niu You-ling Chen Jin Liu State Key Laboratory of Optoelectronic Materials and Technologies School of PhysicsSchool of Electronics and Information TechnologySun Yat-sen University510275GuangzhouChina Hisilicon Research Huawei Technologies Co.Ltd518129ShenzhenChina State Key Laboratory for Superlattice and Microstructures State Key Laboratory on Integrated OptoelectronicsInstitute of SemiconductorsChinese Academy of Sciences100083BeijingChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences100049BeijingChina

The emerging hybrid integrated quantum photonics combines the advantages of different functional components into a single chip to meet the stringent requirements for quantum information *** the tremendous progress in hybrid integrations of III-V quantum emitters with silicon-based photonic circuits and superconducting single-photon detectors,on-chip optical excitations of quantum emitters via miniaturized lasers towards single-photon sources(SPSs)with low power consumptions,small device footprints,and excellent coherence properties is highly desirable yet *** this work,we present realizations of bright semiconductor SPSs heterogeneously integrated with on-chip electrically-injected *** from previous one-by-one transfer printing technique implemented in hybrid quantum dot(QD)photonic devices,multiple deterministically coupled QD-circular Bragg Grating(CBG)SPSs were integrated with electrically-injected micropillar lasers at one time via a potentially scalable transfer printing process assisted by the wide-field photoluminescence(PL)imaging *** pumped by electrically-injected microlasers,pure single photons are generated with a high-brightness of a count rate of 3.8 M/s and an extraction efficiency of 25.44%.Such a high-brightness is due to the enhancement by the cavity mode of the CBG,which is confirmed by a Purcell factor of *** work provides a powerful tool for advancing hybrid integrated quantum photonics in general and boosts the developments for realizing highly-compact,energy-efficient and coherent SPSs in particular.

关键词： pumped quantum photon

Filter-free high-performance single-photon emission from a quantum dot in a Fabry–Perot microcavity

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Photonics Research 2024年第10期12卷 2130-2138页

作者： JIAWEI YANG ZHIXUAN RAO changkun song MUJIE RAO ZIYANG ZHENG LUYU LIU XUEBIN PENG YING YU SIYUAN YU State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information TechnologySun Yat-sen UniversityGuangzhou 510006China Hefei National Laboratory Hefei 230088China

Combining resonant excitation with Purcell-enhanced single quantum dots(QDs)stands out as a prominent strategy for realizing high-performance solid-state single-photon ***,optimizing photon extraction efficiency requires addressing the challenge of effectively separating the excitation laser from the QDs’***,this involves polarization filtering,limiting the achievable polarization directions and the scalability of polarized photonic *** this study,we have successfully tackled this challenge by employing spatially orthogonal resonant excitation of QDs,deterministically coupled to monolithic Fabry–Perot *** the planar microcavity structure,we have achieved spectral filter-free single-photon resonant *** resulting source produces single photons with a high extraction efficiency of 0.87 and an indistinguishability of 0.963(4).

关键词： resonant quantum excitation

基于28 nm RRAM的可重构真随机数发生器

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浙江大学学报（工学版） 2024年第7期58卷 1516-1523页

作者：宋长坤郑彩萍陈铖颖厦门理工学院光电与通信工程学院福建厦门361024

基于阻变存储器(RRAM)电流饥饿型环形振荡器的真随机数发生器(TRNG)方案,提出交替读写的操作模式,优化熵源重构机制.针对现有RRAM在多操作周期下跨导线性化问题,提出熵可配置电阻窗口钳位电路.通过减小电阻窗口获得RRAM非线性的最大化,... 详细信息

基于阻变存储器(RRAM)电流饥饿型环形振荡器的真随机数发生器(TRNG)方案,提出交替读写的操作模式,优化熵源重构机制.针对现有RRAM在多操作周期下跨导线性化问题,提出熵可配置电阻窗口钳位电路.通过减小电阻窗口获得RRAM非线性的最大化,所提电路能够有效避免RRAM出现过度置位、过度复位的现象,保证熵源稳定性.基于UMC 28 nm HKMG工艺对TRNG进行流片.输出数据统计性测试结果通过了NIST SP800-22所有测试集的真随机数标准测试.检测结果表明,在高斯分布的95%置信区间,所有统计数据的自相关函数值均落在-0.003~0.003,输出序列具有良好的随机性.

关键词：阻变存储器(RRAM) 真随机数发生器(TRNG) 熵源电流饥饿型环形振荡器跨导线性

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大学生职业目标的认识误区及其解决——基于岭南师范学院经管类学生的调查

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岭南师范学院学报 2016年第5期37卷 14-19页

作者：宋长琨岭南师范学院商学院广东湛江524048

职业目标是大学生对于自己未来所从事的行业、岗位和职位的设计和规划。调查显示,大学生对于职业目标存在三个方面的认识误区:其一,认为职业目标可有可无,忽视职业规划的重要性;其二,对于设立职业目标的理由不充分,职业目标成了无源之... 详细信息

职业目标是大学生对于自己未来所从事的行业、岗位和职位的设计和规划。调查显示,大学生对于职业目标存在三个方面的认识误区:其一,认为职业目标可有可无,忽视职业规划的重要性;其二,对于设立职业目标的理由不充分,职业目标成了无源之水、无本之木;其三,在目标设计上不够系统,总目标与分目标、大目标与小目标之间缺少密切的关联。对此,学校要加强教育,学生应增进理解,进而设计出科学、合理的职业目标,才能让大学生通过职业规划把自己的理想变成现实。

关键词：大学生职业生涯规划职业目标

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湛江市赤坎老街区的整体保护与开发

湛江师范学院学报 2014年第5期35卷 164-168页

作者：宋长琨岭南师范学院商学院广东湛江524048

湛江市赤坎老街区以民主路、中山路为核心,总体范围东、南至南桥河,西至跃进路、九二一路,北至北桥河之间。赤坎老街区有保存较为完整的老街古巷、传统民居,以及特色鲜明的南洋风格骑楼群和欧陆格调建筑群。对于这个老街区的整体保护,... 详细信息

湛江市赤坎老街区以民主路、中山路为核心,总体范围东、南至南桥河,西至跃进路、九二一路,北至北桥河之间。赤坎老街区有保存较为完整的老街古巷、传统民居,以及特色鲜明的南洋风格骑楼群和欧陆格调建筑群。对于这个老街区的整体保护,可以完整展示湛江的历史底蕴和城市风貌,具有巨大的潜在文化价值。赤坎老街区的整体保护,要在修旧如旧的前提下,对传统建筑、街道及基础设施进行修缮、复原、维护和改造。以此为基础,在老街区范围内有计划地恢复、挖掘、吸纳富有湛江地方特色的文化资源,将老街区改造为一个集参观文化遗存、浏览民俗风情、欣赏传统戏曲、品味特色饮食于一体的地方文化园区,进而整合旅游资源,提升旅游品位,为湛江经济发展提供新的增长点。

关键词：城市老街区整体保护文化遗存旅游资源

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半导体单量子点的分子束外延生长及调控

人工晶体学报 2023年第6期52卷 982-996页

作者：宋长坤黄晓莹陈英鑫喻颖余思远中山大学光电材料与技术国家重点实验室广州510275

Ⅲ-Ⅴ化合物半导体外延单量子点具有类原子的分立能级结构,能够按需产生单光子和纠缠多光子态,而且可以直接与成熟的集成光子技术结合,因此被认为是制备高品质固态量子光源、构建可扩展性量子网络最有潜力的固态量子体系之一。本综述的... 详细信息

Ⅲ-Ⅴ化合物半导体外延单量子点具有类原子的分立能级结构,能够按需产生单光子和纠缠多光子态,而且可以直接与成熟的集成光子技术结合,因此被认为是制备高品质固态量子光源、构建可扩展性量子网络最有潜力的固态量子体系之一。本综述的重点是介绍高品质单量子点的分子束外延生长及精确调控的方法。首先介绍了晶圆级均匀单量子点的分子束外延生长,并探讨了调控浸润层态和量子点对称性的生长方法;接下来概述了利用应变层调控量子点发射波长的方法,总结了几种常见的电调控单个量子点器件的设计原理;最后讨论了最近为实现优异量子点光源而开发的液滴外延生长技术。

关键词：单量子点分子束外延生长调控 S-K模式液滴刻蚀单光子源纠缠光源