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COntinuous VAriable Quantum Information with Atoms and Light

Objective

In the recent years, quantum continuous variables (QCV) have emerged as a tool of major importance for developing novel quantum communication and information processing protocols. Encoding quantum continuous information into the quadrature of a quantized light mode or into the collective spin variable of a mesoscopic atomic ensemble has proven to be a very interesting alternative to the standard concept of quantum bit-based processes. Several experimental breakthroughs have been achieved recently demonstrating this concept, namely the quantum teleportation of a coherent state, the generation of entangled light beams with soliton pulses in nonlinear fibers, the preparation of distant entangled atomic ensembles, or the implementation of a quantum key distribution scheme relying on coherent states. In view of these spectacular results, many developments of QCV information systems can be foreseen.

The present proposal aims at initiating an exploratory research on new quantum informational concepts involving continuous variables, both on the theoretical and experimental sides. It departs from the "traditional" approaches of quantum computing in that we do not address the "scalability" of some potential technology for quantum information processing which is not yet applicable. Instead, we start from a concept that has already been proven very successful in the laboratory. The topics which we plan to cover include improved or novel quantum communication protocols, quantum memories and quantum repeaters based on the light-atoms quantum interface, and the generation of squeezed or entangled solitonic light beams based on various nonlinearities in fibers. The role of non-Gaussian states of light will also be investigated in order to make new QCV informational processes possible. Another focus of this project will be the study of the fundamental physics governing the off-resonant interaction of light with an atomic ensemble.

Funding Scheme

STREP - Specific Targeted Research Project

Coordinator

UNIVERSITE LIBRE DE BRUXELLES
Address
Avenue F.d. Roosevelt, 50
1050 Bruxelles
Belgium

Participants (6)

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE
France
Address
Batiment 503, Centre Universitaire
91403 Orsay
FRIEDRICH-ALEXANDER UNIVERSITAET ERLANGEN - NUERNBERG
Germany
Address
Günther-scharowsky-str. 1 / Bau 24
91058 Erlangen
KOEBENHAVNS UNIVERSITET
Denmark
Address
Blegdamsvej 17
2100 Copenhagen
MAX-PLANCK GESELLSCHAFT ZUR FOERDERUNG DER WISSENSCHAFTEN E.V.
Germany
Address
Hans-kopfermann Str. 1
85748 Garching
THE UNIVERSITY COURT OF THE UNIVERSITY OF ST ANDREWS
United Kingdom
Address
North Haugh
KY16 9SS St Andrews
UNIVERZITA PALACKEHO V OLOMOUCI
Czechia
Address
17. Listopadu 50
77200 Olomouc