2022年3月18日，北京大学物理学院学术论坛2022年春季学期第一讲（总第十三讲）在物理学院思源多功能厅成功举行。洛桑联邦理工学院TOBIAS J. KIPPENBERG教授应邀做了题为“量子光力学与芯片光频梳”（Quantum Optomechanics and Photonic Chip based Frequency Combs）的学术报告。本次论坛由物理学院现代光学研究所、人工微结构和介观物理国家重点实验室、纳光电子前沿科学中心杨起帆研究员主持。

杨起帆研究员主持

Kippenberg教授详细介绍了高品质因子光学微腔与机械振子在集成光子学与量子光学中的应用。首先，基于光学微腔的场增强效应，可以通过辐射压实现光学模式与机械模式的耦合，进而利用光场将机械模式冷却到量子基态；这种处于量子基态的机械振子可以应用于测量微小的作用力，而通过提升机械振子的品质因子，可以实现压缩态，从而突破标准量子极限；除此之外，还可以耦合机械振子与超导量子比特来调控与传递量子态。接着，Kippenberg教授讲述了利用光学微腔中的非线性光学效应产生的芯片级光学频率梳，并深入阐述了孤子锁模的工作原理。然后，展示了一系列基于此类芯片光频梳的重要应用，包括在通信、精密测量、光计算等领域的相关工作。最后，深入分析了实现光学微腔的各种平台，并指明氮化硅是实现超高品质因子最有前景的材料。

Kippenberg教授做报告

报告结束后，现场师生围绕高品质因子微腔的制备、芯片光频梳的应用前景等方面踊跃提问，Kippenberg教授一一给予了深入浅出的解答。

现场互动交流

本期论坛线上、线下同步进行。物理学院副院长徐莉梅教授与来自物理学院和校内相关院系的近五十名师生参与现场交流，通过蔻享学术平台观看直播的观众逾3600人次。

讲座回放链接：https://www.koushare.com/lives/room/614034

报告人简介：

Tobias J. Kippenberg is Full Professor in the Institute of Physics and Electrical Engineering at EPFL in Switzerland since 2013 and joined EPFL in 2008 as Tenure Track Assistant Professor. Prior to EPFL, he was Independent Max Planck Junior Research group leader at the Max Planck Institute of Quantum Optics in Garching, Germany. While at the MPQ he demonstrated radiation pressure cooling of optical micro-resonators, and developed techniques with which mechanical oscillators can be cooled, measured and manipulated in the quantum regime that are now part of the research field of Cavity Quantum Optomechanics. Moreover, his group discovered the generation of optical frequency combs using high Q micro-resonators, a principle known now as micro-combs or Kerr combs.

For his early contributions in these two research fields, he has been recipient of the EFTF Award for Young Scientists (2011), The Helmholtz Prize in Metrology (2009), the EPS Fresnel Prize (2009), ICO Award (2014), Swiss Latsis Prize (2015), as well as the Wilhelmy Klung Research Prize in Physics (2015), the 2018 ZEISS Research Award and 2020 OSA R. Wood Award. Moreover, he is 1st prize recipient of the "8th European Union Contest for Young Scientists" in 1996 and is listed in the Highly Cited Researchers List of 1% most cited Physicists in 2014-2019. He is founder of the startup LIGENTEC SA, an integrated photonics foundry.

北京大学物理学院学术论坛简介：

北京大学物理学院学术论坛创办于2020年9月，邀请国内外高校和研究机构高层次科技创新领军学者就物理学及相关领域的基础前沿探索、关键技术突破和热点问题等做学术演讲，旨在推进高质量学术交流，促进学科交叉融合和开拓新兴特色方向研究，培养具有科学精神、全球视野、创新能力、批判性思维的优秀青年人才。