Introduction

Manipulating information at the quantum level is profoundly different from manipulating it classically. This opens the door to some new and surprising applications such as quantum cryptography (in which the security of the encryption of a message is guaranteed by the laws of physics) or quantum computers (which could solve certain problems such as factoring exponentially faster than classical computers).

The Laboratoire d’Information quantique is actively working on different aspects quantum information, both at the theoretical and experimental level.




Theory:







  Specific work we have realized on the theory of quantum information concerns: quantum state estimation, quantum cloning, quantum non locality and communication complexity, quantum cryptography and quantum coin tossing. Some work also concern the foundations of quantum mechanics, and in particular the interpretation of measurements of energy. Recently we have developped the concept of "device independent information processing" in which the correct functioning of a quantum protocol is certified by Bell's theorem.

 


Experiment:

 

 

 

 

 

 

 

 

 

 We also work on the experimental implementation of the theoretical ideas of quantum information. Earlier results include the realization of an all fiber demonstration of the Deutsch-Jozsa and Bernstein-Vazirani algorithms, an all fiber demonstration of error filtration for quantum communication, and the first provably secure demonstration of quantum coin tossing. Present work is focusing on the development of novel sources of entangled photons, both in fibers and in silicon waveguides; as well as the manipulation of quantum information in the frequency domain.


The Laboratoire d’Information Quantique works in close collaboration with related groups at Université Libre de Bruxelles ( OPERA-Photonique and QUIC), and with many other groups in Belgium, Europe and the rest of the world. It collaborates with them through national and European research projects.