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Quantum information with continuous variables

Objective

The project is focused on the realisation of quantum communication with continuous variables such as the quadrature amplitudes of the quantized electromagnetic field. The advantage of using these highly excited quantum systems involving many photons in a light field, over single particle quantum systems is the prospect for high optical data rates and simple processing tools, based upon techniques used in telecommunication. The main objectives of the project are transfer and storage of continuous quantum information encoded on light and on matter systems, and the implementation of quantum cryptography using quantum continuous variables. This project addresses objective 3 "Long distance and secure communication" of the QIPC workprogram. The specific items of the workplan will be the development and assessment of many-photon entangled state sources, of quantum repeaters and memories, and the implementation of quantum teleportation and quantum cryptography. The project is focused on the realisation of quantum communication with continuous variables such as the quadrature amplitudes of the quantized electromagnetic field. The advantage of using these highly excited quantum systems involving many photons in a light field, over single particle quantum systems is the prospect for high optical data rates and simple processing tools, based upon techniques used in telecommunication. The main objectives of the project are transfer and storage of continuous quantum information encoded on light and on matter systems, and the implementation of quantum cryptography using quantum continuous variables. This project addresses objective 3 "Long distance and secure communication" of the QIPC workprogram. The specific items of the workplan will be the development and assessment of many-photon entangled state sources, of quantum repeaters and memories, and the implementation of quantum teleportation and quantum cryptography.

OBJECTIVES
The general goal of the project is the realisation of quantum communication with continuous variables. More specifically, the project will focus on three key objectives:
- transmission of quantum continuous variables, e.g. "quantum teleportation of quantum continuous variables";
- storage of quantum continuous variables;
- quantum cryptography, i.e. provably secure information transfer involving continuous variables.

DESCRIPTION OF WORK
Continuous quantum Variables (QCV) provide a new approach to quantum information processing and quantum communication. It uses highly exited quantum systems, such as quadrature amplitudes of the light field. While keeping the known benefits of discrete quantum systems, continuous variables offer additional advantages over the single photon systems predominantly studied so far. Among these advantages are the prospect for high optical data rates and simple processing tools. Within the present project the following items will be explored:
1. The demonstration and the implementation of light sources with entangled QCV; including amplification of single photon sources;
2. The design of practical ways for transfering information between QCV encoded on matter and on light observables, i.e. read-in read-out of quantum memories;
3. The demonstration of the transmission of quantum information with bright light sources;
4. The elaboration of new schemes for quantum cryptography with QCV, including the exploration of the relevant schemes for entanglement purification and quantum error correction.

The background of this proposal is provided by the results of the past years on squeezing, quantum non-demolition measurements, noiseless manipulation of optical beams obtained in the framework of previous ESPRIT projects. It was shown recently that these methods allow one to manipulate quantum entanglement and EPR correlations, which are crucial features to reach the QIPC domain.

Call for proposal

Data not available

Coordinator

FRIEDRICH-ALEXANDER UNIVERSITAET ERLANGEN - NUERNBERG
Address
Schlossplatz 4
91054 Erlangen
Germany
 

Participants (9)

AARHUS UNIVERSITET
Denmark
Address
Nordre Ringgade 1
8000 Aarhus
 
CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE
France
Address
3, Rue Michel-ange
75794 Paris Cedex 16
 
CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE
France
Address
3, Rue Michel-ange
75794 Paris Cedex 16
ECOLE NORMALE SUPERIEURE PARIS
France
Address
45, Rue D'ulm
75230 Paris Cedex 05
THE AUSTRALIAN NATIONAL UNIVERSITY
Australia
Address

0200 Canberra Act
 
UNIVERSITY OF SOUTHAMPTON
United Kingdom
Address
Highfield
SO17 1BJ Southampton
 
UNIVERSITY OF SOUTHAMPTON
United Kingdom
Address
Highfield
SO17 1BJ Southampton
 
UNIVERSITY OF WALES, BANGOR
United Kingdom
Address
Finance Office, University Of Wales, Bangor, College Road
LL57 2DG Bangor
 
UNIVERZITA PALACKEHO V OLOMOUCI
Czechia
Address
Krizkovskeho 8
Olomouc