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Invited Talk by Dr. Abhishek Kumar, Jawaharlal Nehru Centre For Advanced Scientific Research (JNCASR), Bengaluru, INDIA.

ECE Conference Room ECE Department, Roorkee

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.

Invited Talk by Dr. Vinay Kumar B. R. , Postdoctoral Researcher at Eindhoven University of Technology ; Talk Title: Community detection on geometric graphs

ECE Conference Room ECE Department, Roorkee

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.

Invited talk by Dr. Harshan Jagadeesh, Talk Title: On Spatial-Provenance Recovery in Wireless Networks with Relaxed-Privacy Constraints

ECE Conference Room ECE Department, Roorkee

Talk Abstract: A number of applications in next-generation networks impose low-latency requirements on learning the provenance of the packets, which in turn could be used for learning the topology of the network. While the state-of-the-art provenance embedding methods focus on the footprint of information flow, there exist interesting use-cases in vehicle-to-everything networks, wherein the road side units intend to learn the spatial-provenance of the packets to offer various location-based services and for detecting security threats on the network. Although vehicles use the global positioning system for navigation, they may refrain from sharing their exact GPS coordinates to the RSUs due to privacy considerations. Thus, to address the localization expectations of the RSUs and the privacy concerns of the vehicles, in this talk, we will present a relaxed-privacy model wherein vehicles share their partial location information through spatial-provenance in order to avail the location-based services. To implement this notion of relaxed privacy, we discuss a low-latency protocol for spatial-provenance recovery, wherein vehicles use correlated linear Bloom filters to embed their position information. Our proposed spatial-provenance recovery process takes into account the resolution of localization, the underlying ad hoc protocol, and the coverage range of the wireless technology used by the vehicles. Through a rigorous theoretical analysis, we present extensive analysis on the underlying trade-off between relaxed-privacy and the communication-overhead of the protocol. Finally, using a wireless testbed, we show that our proposed method requires a few bits in the packet header to provide security features such as localizing a low-power jammer executing a denial-of-service attack. About the speaker: Dr. Harshan Jagadeesh is an Associate Professor in the Department of Electrical Engineering, Indian Institute of Technology Delhi. He is also the co-coordinator of the center of excellence on cybersecurity and information assurance at IIT Delhi. Prior to joining IIT Delhi, he worked as a Researcher in the CyberSecurity group at Advanced Digital Sciences Center, Singapore. Before that he worked as a Research Fellow in the Division of Mathematical Sciences, Nanyang Technological University, Singapore and in the Department of Electrical and Computer Systems Engineering at Monash University, Australia. He obtained the Ph.D. degree from the Department of Electrical Communication Engineering, Indian Institute of Science, India. His research interests are in the broad areas of security and privacy applied to wireless and storage networks. All are cordially invited to attend the lecture.