ELFT HÍRADÓ

[Király Beáta <kiraly.beata AT atomki.hu>]

From West Bengal to Debrecen: 
a journey into quantum complementarity 

by Patra Ram Krishna (HUN-REN ATOMKI) 



When: 2026-03-19 Thursday 11:00 

Where: HUN-REN ATOMKI, nagyelőadó (Debrecen, Bem tér 18/c) 





Other information: 

- This seminar is part of a series dedicated to introducing new colleagues. 
- Tea and cookies are offered 30 minutes before the seminar. 



Abstract: 


This talk begins with a brief introduction to myself, my home state of West 
Bengal in India and my research interests. West Bengal has a rich cultural 
heritage and diverse geography, and I will briefly highlight its language, 
landscape and local cuisine. 



I will then introduce my research area, quantum information theory and 
quantum communication. Starting from Bohr’s complementarity principle, which 
states that certain properties cannot be observed simultaneously, I will 
discuss its extension from single systems to ensembles of quantum states. I 
will show that ensemble incompatibility depends on the configuration of input 
states by analysing three spin observables for parallel and antiparallel 
state pairs. This leads to a “No-Comparison Theorem,” demonstrating that the 
degree of incompatibility varies with configuration, with implications for 
quantum information-processing tasks. 




--- 
Király Beáta, PhD 
HUN-REN ATOMKI / HUN-REN Atommagkutató Intézet 
C: 4026 Debrecen, Bem tér 18/c 
T: +36 52 509 200 
E: kiraly.beata AT atomki.hu 
W: [ http://www.atomki.hu/ | www.atomki.hu ]