EQUIP: Entanglement in quantum information processing and communication

• Unité de recherche: PCRD EU
• Numéro de projet: 99.0467
• Titre du projet anglais: EQUIP: Entanglement in quantum information processing and communication

Mots-clé (Anglais)

Quantum information processing

Autre Numéro de projet (Anglais)

EU project number: IST-1999-11053

Programme de recherche (Anglais)

EU-programme: 5. Frame Research Programme - 1.2.8 Generic R&D activities

Description succincte (Anglais)

See abstract

Partenaires et organisations internationales (Anglais)

Coordinator: Universität Potsdam (D)

Résumé des résultats (Abstract) (Anglais)

This theoretical project gathers a very large group of European experts in quantum information theory. In 2001 two collaborations produced success. First, together with colleagues at Bristol University, UK, and at the ULB, Belgium, a generalization of the famous Bell inequality to quantum systems of arbitrary dimensions was discovered. This work appeared in Phys. Rev. Lett. in early January 2002 and was highlighted by Nature. Recall that Bell inequalities are the quantitative side of the phenomenon called quantum non-locality. The second collaboration was within Switzerland with colleagues from the ETHZ, Prof. U. Maurer and his student M. Fitzi. We developped a quantum solution to an old problem in distributed computing. In its simplest form, a sender has to broadcast some information to two receivers, but they have access only to pairwise communication channels. Unlike quantum key distribution, here the goal is not secrecy but agreement, and the adversary (one of the receivers or the sender himself) is not outside but inside the game. Using only classical channels this problem is probably impossible. The solution uses pairwise quantum channels and entangled qutrits (i.e. 3- dimensional quantum systems). This is the first example of a quantum communication protocol requiring quantum systems of dimension larger than two (i.e. not qubits). This work appeared in Phys. Rev. Lett. 87,19, 2001, and has been accept by Eurocrypt 2002.

Références bases de données (Anglais)

Swiss Database: Euro-DB of the
State Secretariat for Education and Research
Hallwylstrasse 4
CH-3003 Berne, Switzerland
Tel. [phone]
Swiss Project-Number: 99.0467