（1）主题：Optoelectronic Properties and Photodetection of Emerging 2D Glassy-Graphene
In this talk, the presenter will firstly introduce an emerging graphene derivative, 2D glassy-graphene, discovered and named by his Ph.D. group at University College London. Originated from the distorted crystal lattice dominated by the Stone-Wales defects, glassy-graphene exhibits intriguing and specific optoelectronic properties, including tunable electrical conductivity, optical transparency, thickness-dependent bandgaps and good air-stability. With performing a series of experimental and theoretical studies, he has revealed the mechanisms behind defect density induced impacts on optoelectronic features and carrier transport characteristics at heterojunction interfaces. Novel and transparent glassy-graphene photodetectors with high performance were then achieved. Consequently, these studies have demonstrated the potential of glassy-graphene for integrated broadband photodetection and also volatile organic compound sensing, providing a promising solution for optoelectronics further beyond.
Hao Xu received his Ph.D. degree in Photonics and Nanotechnology from University College London (UCL) in 2019. Dr. Xu is now a full-time Research Professor and a part-time Postdoctoral Research Fellow at University of Electronic Science and Technology of China (UESTC). He has been granted the MOHRSS International Postdoctoral Exchange Fellowship Program (National Talent-Introduction Program) in 2019 and the UESTC 100-Talent Program in 2020. His current research is mainly focused on optoelectronic properties of low-dimensional semiconductors, including graphene, glassy-graphene, TMDs and hybrid systems, and their applications for nanoelectronics and optoelectronics.
（1）主题：Multiplexed and broadband quantum memory for single photons at telecom C-band
Quantum networks are of great significance for multi-party quantum communication, distributed quantum computing and quantum metrology, etc. To construct global quantum networks, one of the building blocks is to entangle remote stationary quantum network nodes, where telecom C-band photons are the best media considering its low fibre transmission loss and convenient qubit encoding. For stationary quantum network node, the best choice is to use a quantum memory that can store photons traveling around the network nodes. Realizing a high-performance quantum memory with high efficiency, long storage time, large bandwidth, and multimode capacity, etc. has become more and more important for global quantum networks.
In this talk, I will briefly introduce our work about realizing a fibre-based quantum memory with large bandwidth and multimode capacity. We firstly develop technologies for preparing broadband atomic frequency combs (AFC) and successfully prepare five separate 10 GHz-wide AFC in an erbium-ions doped fibre (EDF), which is across a total 70 GHz inhomogeneous broadening, then demonstrate broadband quantum storage of telecom C-band single photons with a time-bandwidth product up to 11500. In the end, we demonstrate quantum storage of 1650 spectrally and temporally multiplexed modes of single photons with sub-ns width. Our work paves an important step for implementing quantum networks based on multiplexed and broadband solid-state quantum memories.
B. Jing received the Bachelor degree and Ph.D. degree from University of Science and Technology of China, in 2013 and 2019, respectively. He currently works as a Postdoctoral Fellow in the Institute of Fundamental and Frontier Sciences of UESTC. Dr. Jing serves as a referee for Physical Review Journals of APS and is working in the field of quantum networks with multiple quantum memories. His main research interests include high-performance quantum memory, photon-atom/atom-atom entanglement; quantum repeater and quantum communication. Several related works have been published in Nature, Nature Photonics and Physical Review Letters, etc.
编辑：林坤 / 审核：林坤 / 发布：陈伟