11 November 2025

Title: Preservation and Utilization of Quantum Correlations in Information Processing tasks

Speaker: Mr. Pritam Halder, Harish-Chandra Research Institute, Prayagraj

Abstract of Talk : Direct quantum communication is constrained by the decay of quantum correlations during transmission. To mitigate these losses over long distances, repeater-based architectures have been proposed, though decoherence in quantum memories continues to limit the performance. In this talk, I will introduce a framework for quantum networks operating under non-Pauli noise, going beyond the widely used Pauli-twirled approximations. Next, I will show how the spatial quantum correlations can extract quantum advantage in classical communication tasks under limited set of resources on the sender’s side; revealing the counterintuitive phenomenon of more capacity with less entanglement. Finally, extending the study of quantum correlations to the temporal domain, I will present a metrological protocol that exploits quantum time-flip encoding procedure, a higher-order quantum operation, to enhance the sensing of unitary parameters.

Profile of Speaker: I am currently pursuing my doctoral studies as a member of the Quantum Information and Computation (QIC) group at the HRI, India, under the supervision of Professor Aditi Sen (De). My research mainly focuses on protocols for sharing entanglement and non-locality in quantum networks, quantum metrology, and quantum communication.