Invited Lecture

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Title of the Talk:  Terahertz Topological Photonic Integrated Circuits for 6G communication Venue: Conference Room, Dept. of ECE, IIT Roorkee Date: Feb 6, 2025 Time:   12 PM to 1 PM Abstract of Talk: The advent of the 5G communication network has revolutionized connectivity, catering to both individual and societal needs by enabling high-speed internet connectivity, virtual reality, and the Internet of Things (IoT). However, as digitalization, massive connectivity, and artificial intelligent (AI) driven applications rapidly proliferate, there arises a necessity to look beyond 5G towards the realm of 6G communication. 6G is expected to bridge the gap between digital, physical, and biological worlds by supporting services such as holographic telepresence, extended reality (XR), remote surgery, and high accuracy sensing (see Fig.1). To bring these into reality, it is imperative to develop high-speed on chip communication architecture which could seamlessly integrate with the 6G wireless communication system. To achieve this goal, we leverage the distinct properties of topological photonic systems, exploiting their robust transport of light properties to develop integrated photonic circuits. The incorporation of topology into photonics aims to achieve resilient and lossless transport of light at will. In this talk, I will present how by leveraging the robust transport of light offered by topological photonic systems, we can develop integrated photonic circuits for emerging 6G communication. Specifically, I will show our devised silicon topological chip that exhibits a single channel on-chip communication link with 160 gigabits/s data rate. Furthermore, I will discuss various perspectives and underlying physics that can be utilized for the development of on-chip components such as add-drop filter and on-chip antenna for 6G technologies. Biography: Dr. Abhishek finished his integrated BS-MS degree from IISER Kolkata in 2016. He obtained PhD in Physics and Applied Physics from Nanyang Technological University (NTU), Singapore in 2020. During the doctoral study, he discovered the elusive excitonic phase in two-dimensional perovskite materials that provide record efficiencies for light-to-electricity conversion in solar cells. His work demonstrated the application of excitons in designing an ultrafast terahertz modulator with 50 GHz modulation speed for emerging 6G communication. He did his postdoctoral research on “Silicon Topological Terahertz Photonics for 6G communication devices” at Centre for Disruptive Photonic Technologies (CDPT) Singapore. He joined JNCASR as an Assistant Professor in August 2023.  His Ultrafast Terahertz Spectroscopy and Photonics (UTSP) lab at JNCASR is primarily interested in unveiling the fundamental properties of emerging quantum materials and terahertz photonic integrated circuits, that hold promise for next generation quantum technologies and photonic integrated circuits for 6G communication.

All of you are cordially invited to attend an invited talk by Dr. Vinay Kumar B. R., Postdoctoral Researcher at Eindhoven University of Technology on 13th January 2025 (Monday) at 11 am in the ECE Conference Room (ECE Department). Talk Title: Community detection on geometric graphs Abstract In many real-world networks, such as co-authorship and social networks, the graph structure is correlated with the locations of the nodes. The geometric dependence is typically evidenced by the absence of long-distance edges and the abundance of triangles. Detecting latent communities on such geometric graphs has been an important direction of research. We consider the community recovery problem on a random geometric graph where every node has two independent labels: a location label and a community label. A geometric kernel maps the locations of pairs of nodes to probabilities. Edges are drawn between pairs of nodes based on their communities and the value of the kernel corresponding to the respective node locations. Given the graph so generated along with the location labels, the latent communities of the nodes are to be inferred. In this talk, we will look into the fundamental limits for recovering the communities in such models. Additionally, we propose a linear time algorithm (in the number of edges) and show that it recovers the communities of nodes exactly up to the information-theoretic threshold. About the speaker: Dr. Vinay Kumar B.R. did his PhD in the Dept. of Electrical Communication Engineering at the Indian Institute of Science, Bangalore, under the guidance of Prof. Navin Kashyap. His thesis was titled “Probabilistic Forwarding of Coded Packets for Broadcasting over Networks”. He was a post-doctoral researcher at INRIA Sophia Antipolis - Méditerranée working with Konstantin Avrachenkov in the NEO team prior to joining the NETWORKS-COFUND program in 2024, where he currently works with Nelly Litvak and Remco van der Hofstad at the Eindhoven University of Technology, Netherland. Broadly, his research is in the areas of random graphs and network science. He is interested in problems that involve a graph structure and complex interactions between the network elements. His research goal is to propose and analyse robust mathematical models that capture different physical phenomena observed on practical networks.