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pRobabilistic gAtes Making Binary Optical Quanta

Objective

We will explore the possibility of building scalable quantum information processors using novel ideas of linear quantum logic. This will include probabilistic CNOT gates assembled from single photon sources and sources of entangled states. We will also investigate the development of higher dimensional quantum logic aimed at developing error resilient quantum networks. Supporting work will develop logic realisations. A theoretical effort will aim to increase the efficiency of simple gate and look at scalability, error correction and the overall limits to this technology. We will explore the possibility of building scalable quantum information processors using novel ideas of linear quantum logic. This will include probabilistic CNOT gates assembled from single photon sources and sources of entangled states. We will also investigate the development of higher dimensional quantum logic aimed at developing error resilient quantum networks. Supporting work will develop logic realisations. A theoretical effort will aim to increase the efficiency of simple gate and look at scalability, error correction and the overall limits to this technology.

OBJECTIVES
Ultimately RAMBOQ seeks to develop the technologies supporting elementary scalable quantum processors and robust optical links between separated quantum processors. It aims to do this by developing on novel schemes for efficient quantum computation using conditional linear logic.
Studying the theoretical limits to conditional linear logic we will reduce gate complexity and increase efficiency. Experimentally we will demonstrate efficient creation of single photon input states, single mode entangled states and efficient readout detectors. Starting from a single gate our ultimate goal will be to demonstrate scalability through a cascaded (few gate) quantum logic circuit. We would also like to demonstrate applications of logic in novel quantum communication schemes: sharing and teleportation of quantum states for quantum networking, distributed quantum processing and other quantum communication protocols. Finally we will investigate novel logic schemes using higher order states for multi-party quantum protocols.

DESCRIPTION OF WORK
The project is arranged into six work parts:
WP0 Management and dissemination of results.
WP1 Theory of linear quantum logic.
WP2 Input-output: single photon sources and detectors.
WP3 Implementation of quantum logic.
WP4 Tools for Quantum Networks. Higher dimensional Hilbert space.
WP6 Applications. We will develop simplified logic gates in WP1 and feed these designs to WP3, WP4 and WP6.
WP2 will develop time bandwidth limited single photon sources suitable for logic and demonstrate the fundamental interference effects required.
Similar developments on entangled pair sources will be carried out in WP3 and an eventual experiment will demonstrate a scalable gate combining entangled state and single photon sources. Such gates will show low errors arising from interference only but may suffer from low efficiency. We will directly address this low efficiency with novel designs for single photon sources and detectors WP2 and with novel gate design WP1/3. The simple gates developed will be directly applied to novel quantum network ideas to show novel quantum states and use also investigate higher order encoding using higher order quantum states and use such states for emerging multiparty communication proptocoles WP5. Output from the programme leading to nearer term applications will be analysed in WP6.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

UNIVERSITY OF BRISTOL
Address
Senate House, Tyndall Avenue
BS8 1TH Bristol
United Kingdom

Participants (12)

FRIEDRICH-ALEXANDER UNIVERSITAET ERLANGEN - NUERNBERG
Germany
Address
Schlossplatz 4
91054 Erlangen
HEWLETT-PACKARD LIMITED
United Kingdom
Address
Cain Road
RG12 1HN Bracknell
ID QUANTIQUE SA
Switzerland
Address
Rue Cingria 10, C/ Gregoire Ribordy
1205 Geneve
ISTITUTO NAZIONALE PER LA FISICA DELLA MATERIA
Italy
Address
Corso F. Perrone 24
16152 Genova
LUDWIG-MAXIMILIANS-UNIVERSITAET MUENCHEN
Germany
Address
Geschwister-scholl-platz 1
80539 Muenchen
THALES
France
Address
45 Rue De Villiers
92200 Neuilly Sur Seine
THE CHANCELLOR, MASTERS AND SCHOLARS OF THE UNIVERSITY OF CAMBRIDGE
United Kingdom
Address
The Old Schools, Trinity Lane
CB2 1TN Cambridge
THE UNIVERSITY OF QUEENSLAND
Australia
Address

QLD4072 Brisbane, Queensland
TOSHIBA RESEARCH EUROPE LIMITED
United Kingdom
Address
260 Cambridge Science Park, Milton Road
CB4 0WE Cambridge
UNIVERSITAET WIEN - INSTITUT FUER EXPERIMENTALPHYSIK
Austria
Address
Boltzmanngasse 5
1090 Wien
UNIVERSITE DE GENEVE
Switzerland
Address
Rue Du General Dufour 24
1211 Geneve 4
UNIVERSITE PARIS 7 DENIS DIDEROT
France
Address
Place Jussieu 2
75251 Paris Cedex 05