What we do
Our research interests lie in the intersection of information theory, computer science and quantum physics. The main focus is on the mathematical foundations of the theory of quantum information, for example the study of entropy and other information measures and their applications. A particular application area of our research are theoretical questions that arise in quantum communication and cryptography when the available resources are limited.
Information processing with finite resources


A challenge when engineering quantum processors is that complex quantum systems are notoriously hard to prepare and control. Thus, there will be limitations on the size and noise resilience of quantum computers for the foreseeable future. We investigate quantum information processing with noisy and limited resources


For example, we analyse the fundamental limits that restrict information transmission between two parties that possess a small quantum device.


Cryptography in a
quantum world


Securing information against potential adversaries is a ubiquitous challenge in our modern world, appearing in diverse guises such as sending private email and online commerce, among myriad others. Quantum cryptography studies secure information processing using quantum devices. 


For example, we devise security proofs for cryptographic schemes — formal mathematical arguments that certify that the behavior of a given protocol is indeed secure.


Mathematical Foundations of Quantum Information


New results on mathematical properties of information and correlation measures often have various applications beyond the specific ones that originally inspired the research. As such, progress in information theory often goes hand in hand with a more thorough understanding of the mathematical framework underlying it. 


For example, we explore measures of entropy, information and correlation based on Rényi divergences.


Some recent work is presented on the blog

Who we are
Marco Tomamichel

Marco Tomamichel

Principal Investigator

I am an Associate Professor with the Department of Electrical and Computer Engineering as well as a Principal Investigator with  the Centre for Quantum Technologies at the National University of Singapore (NUS). I am currently an Associate Editor for the IEEE Transactions on Information Theory.
I obtained a Master of Science degree from the Department of Electrical Engineering and Information Technology at ETH Zurich, and a doctorate in Theoretical Physics also from ETH Zurich. Before starting my current position I was a postdoc at the Centre for Quantum Technologies, a University of Sydney Postdoctoral Fellow and Australian Research Council Discovery Early Career Researcher Award fellow and Associate Professor at the University of Technology Sydney (UTS).
My full CV is available here and my publications can be viewed on Google Scholar or arXiv.org.
My ORCID number is 0000-0001-5410-3329.


Yingkai Ouyang

Quantum error correction, quantum homomorphic encryption, quantum metrology

Yingkai Ouyang

Research Fellow

Erkka Haapasalo

Quantum measurement theory, quantum resource theories

Erkka Haapasalo

Research Fellow

Christoph Hirche

Quantum communication and information theory

Christoph Hirche

Research Fellow
(Marie-Curie) 

Michael_Xuan_Cao

Classical and quantum information theory

Michael X. Cao

Research Fellow

Josep Lumbreras

Quantum learning theory: multi-armed quantum bandits

Josep Lumbreras

PhD student, CQT

Roberto Rubboli

Quantum resource theories: catalytic processes

Roberto Rubboli

PhD student, CQT

Navneeth Ramakrishnan

Quantum communication and information theory

Navneeth Ramakrishnan

Research Associate
(Visiting PhD student)

Alumni
We are always looking for new talent with a strong interest and a track-record in the above topics. Please contact us.