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Engineered Quantum Information in Nanostructured Diamond

Objective

The key elements required for quantum information processing are:
- Low error encoding of qubits onto individual quantum systems
- Storage of quantum information for times long compared to gate times
- Controllable two qubit interactions forming fast quantum gates.

Our candidate systems are the paramagnetic colour centres in diamond. They offer at individual spin control and at room temperature very long coherence times compared to quantum gate processing times. The primary objective of this project is to use such defects in nanostructured diamond to implement scalable quantum logic gates, with the prospect of room temperature operation. Such elements rely on electron spin splitting of ground states in specific colour centres in diamond. Read-out of the single electron spin state can be achieved through optical detection of the colour centre strong photoluminescence, which is perfectly photostable even at room temperature.

An order-of-magnitude improvement of the detection efficiency is therefore of crucial importance for achieving single shot read-out of the state of the addressed spin, and is one of the main objectives of the project. Coherent single photon wavepackets are also one of the building blocks for a photon-based quantum processor. Since individual colour centres in diamond have been shown as promising single photon source, temporal coherence of the emitted single photons will be investigated.

The project involves 8 groups, all leading experts in the field of diamond material processing and application of diamond to quantum information. It strongly relies on recent developments in the synthesis and processing of high purity isotopically engineered intrinsic and doped single crystal diamond, the production and functionalization of diamond nanocrystals, and methods of controlled activation of defect centres suitable for quantum computing. Such developments will also benefit to diamond colour centre based single photon sources for quantum cryptography.

Funding Scheme

STREP - Specific Targeted Research Project

Coordinator

ECOLE NORMALE SUPERIEURE DE CACHAN
Address
Avenue Du President Wilson 61
94235 Cachan
France

Participants (7)

BI STEPANOV INSTITUTE OF PHYSICS OF
Belarus
Address
Nezavisimosti Ave 68
220072 Minsk
CHRISTIAN-ALBRECHTS-UNIVERSITAET ZU KIEL
Germany
Address
Olshausenstrasse 40
Kiel
ELEMENT SIX LIMITED
United Kingdom
Address
Kings Ride Park
SL5 8BP Ascot
THE UNIVERSITY OF MELBOURNE
Australia
Address
Parkville Office Of The Vice Chancellor
3010 Melbourne
THE UNIVERSITY OF WARWICK
United Kingdom
Address
University House, Kirby Corner Road
CV4 8UW Coventry
UNIVERSITAET STUTTGART
UNIVERSITY OF BRISTOL
United Kingdom
Address
Senate House, Tyndall Avenue
Bristol