直播时间：2025年3月4日（周二）20:00-21:30

 

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https://weibo.com/l/wblive/p/show/1022:2321325140503267246248

 

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北京时间3月4日晚八点，iCANX Youth Talks第87期邀请北京大学物理学院助理教授杨起帆，深圳国际量子研究院研究员刘骏秋担任主讲，中国科学院长春光机所研究员李炜、北京大学教授张海霞担任研讨嘉宾，北京大学物理学院彭湃担任主持人，期待你一起加入这场知识盛宴。

 

【嘉宾介绍】

 

 

杨起帆

 

北京大学物理学院

 

克尔微梳的量子特性

 

【Abstract】

 

An optical frequency comb is a cluster of equally spaced spectral lines, providing a coherent bidirectional link between optical and microwave signals. The realization of these combs in optical microresonators, particularly those generated through Kerr nonlinearities, offers a chip-based solution for numerous applications ranging from precision metrology to telecommunications. While the dynamics of these Kerr microcombs are well-described by the classical Lugiato-Lefever equations, their quantum nature has often been overlooked. In this talk, I will present our recent studies of quantum effects in Kerr microcombs, including quantum-limited timing noise in bright soliton and dark pulse microcombs, as well as protocols to surpass these limits. We also correlated non-classical light in Kerr microresonators, resulting in the largest-scale cluster state on photonic chips to date.

 

光学频率梳由一系列间隔均匀的相干谱线构成，可在光信号与微波信号之间双向的相干连接。在光学微腔中实现光梳，尤其是利用克尔非线性效应产生的克尔微梳，为从精密计量到电信等众多领域提供了一种基于芯片的解决方案。不过，尽管这些克尔微梳的动力学行为可以用经典的Lugiato-Lefever方程得到较好描述，但其量子特性在之前的研究中常常被忽视。在本次报告中，我将介绍我们近期关于克尔微梳的量子效应的研究成果，包括对亮孤子和暗脉冲微梳中量子噪声的测量，以及突破这一极限的相关技术方案。同时，我们还对克尔微腔中非经典光的关联性进行了研究，从而实现了迄今为止在光子芯片上规模最大的簇态纠缠。

 

【BIOGRAPHY】

 

Qifan Yang received his B. Sc in Physics from Peking University in 2013, and Ph. D. in Applied Physics from Caltech in 2019. He worked as a postdoctoral scholar in Caltech before he joined School of Physics, Peking University in 2020, where he is presently an assistant professor in Physics. His research interests span integrated photonics and nonlinear optics to high-Q microresonators and optical frequency combs.

 

杨起帆博士是北京大学物理学院助理教授。2013年本科毕业于北京大学物理学院，2019年获得加州理工学院应用物理博士学位。2020年加入北京大学物理学院现代光学研究所。主要研究方向包括集成光子学与非线性光学，在Science、Nature等国际期刊上发表40余篇论文。

 

 

刘骏秋

 

深圳国际量子研究院

 

超低损耗氮化硅异质集成光学

 

【ABSTRACT】

 

The synthesis, distribution and processing of optical signals is ubiquitous in our information society. Conventional fiber optical technology is currently facing increasing demands that require high performance but with small size, weight and power consumption. In the last decade, with the advancement of CMOS technology and emerging materials, integrated photonics has become a mature technology that enables the generation, modulation, and detection of optical signals on-chip. Integrated photonics can resolve the bottlenecks limiting current optical telecommunications and datacenters. Among all materials used so far, silicon nitride featuring a wide transparency window and ultralow optical loss has become a mainstream platform together with silicon and indium phosphide. This talk will cover major recent advancements in ultralow-loss silicon nitride integrated photonics and its applications, particularly those achieved by the speaker in the last 5 years.

 

未来的信息系统将不得不面对日益增长的数据量和处理需求。传统的光纤技术将会在解决这些挑战上遇到瓶颈 。近年来，随着半导体材料生长和微纳加工技术的发展，集成光学正在成为解决信息系统瓶颈的核心技术，并将产生数十亿至数千亿美元的市场需求。在众多集成光学材料平台中，氮化硅以其超低光损耗的优越表现，已经成为继硅和磷化铟之后第三大主流集成平台，尤其是利用氮化硅集成光路构建芯片集成的光频梳、窄线宽激光器、超低噪声微波源和复杂网络。本报告将介绍近年来超低损耗异质集成氮化硅光芯片技术的发展和其在量子信息、精密测量和传感、激光雷达、光计算等的前沿应用，并着重介绍报告人在本领域的一些列重要结果。

 

【BIOGRAPHY】

 

Junqiu Liu is currently a senior research fellow (PI) at Shenzhen International Quantum Academy and a tenure-track assistant professor at Hefei National Laboratory, University of Science and Technology of China (USTC). He is also serving as an associated editor of Phys. Rev. Applied at American Physical Society (APS). He received PhD from EPFL in 2020, MSc from the University of Erlangen-Nuremberg in 2016, and BSc from USTC in 2012. His research is in the domains of integrated photonics, nonlinear optics, quantum optics, MEMS and microwave photonics. His PhD thesis entitled “Silicon Nitride Nonlinear Integrated Photonics” was awarded 2021 EPFL Doctorate Award, “For ground breaking experiments in the field of chip-scale frequency combs and the extraordinary record of scientific accomplishments”. His research has seeded several startups.

 

刘骏秋，深圳国际量子研究院研究员，合肥国家实验室研究员；美国物理学会Phys. Rev. Applied副主编。他2020年获瑞士洛桑联邦理工大学博士学位，博士论文被授予年度博士论文奖，以表彰他“在片上集成光频率梳技术上的突破性实验工作和卓越的成果”；2016年获德国埃尔朗根纽伦堡大学硕士学位并获最高毕业荣誉；2012年获中国科学技术大学学士学位。他主要的研究领域为集成光学、非线性光学、量子光学、微机电系统和微波光子学等。他已发表文章超过90篇，自2022年起连续入选斯坦福全球前2%顶尖科学家名单。他的研究成果入选2021/2022/2024国际光学学会评选年度亮点工作。由他带领研发的技术已经成功孵化多家国内外初创公司。他获得的荣誉包括2023年深圳市最美科技工作者，中国光学工程学会首届PhotoniX Prize青年科学家奖， 2020年麻省理工科技评论评“35岁以下35位科技创新”中国榜单入选者等。

 

【主持人】

 

 

彭湃

 

北京大学

 

【研讨嘉宾】

 

 

李炜

 

中国科学院长春光机所

 

 

张海霞

 

北京大学