Topic: Extending Quantum Key Distribution security proofs to practical detectors
Name of the speaker:Â Mr. Devashish Tupkary
đź“… Date:Â 12th September 2025,4PM
⏰ Time: 4 PM IST
đź“ŤVenue:Â SVN Auditorium, IAP Department
Abstract: Quantum Key Distribution (QKD) is among the most mature and exciting applications of quantum information science, providing an information-theoretically secure way to establish cryptographic keys between distant parties. In this talk, I will introduce the fundamentals of QKD and associated security proofs, through the lens of entropic uncertainty relations. I will then discuss the assumptions on physical hardware that appear in this approach, and show that they can be relaxed, thereby obtaining security proofs that are applicable in practical implementations. This talk will be based on https://arxiv.org/abs/2408.17349 .
About Speaker:
Mr. Devashish Tupkary obtained his undergraduate BS (Research) degree from IISC before pursuing his graduate studies at the University of Waterloo, Canada. He is broadly interested in both the theoretical and practical aspects of quantum information and computation, with a particular focus on Quantum Key Distribution (QKD). During his graduate studies, his work has primarily centered on the security analysis of practical QKD protocols. He remains deeply engaged with all aspects of QKD, especially security proofs and the pathway toward certification. More recently, He has also begun exploring classical cryptography and the
broader field of quantum cryptography. In addition, he continues his earlier work on accurate descriptions of open quantum systems, where he is interested in understanding the validity and limitations of various quantum master equations, beyond specific system–bath models.Â