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Details of Grant 

EPSRC Reference: EP/M024458/1
Title: Spin-photon systems for scalable quantum processors
Principal Investigator: Rarity, Professor J
Other Investigators:
Researcher Co-Investigators:
Project Partners:
Department: Electrical and Electronic Engineering
Organisation: University of Bristol
Scheme: EPSRC Fellowship
Starts: 01 April 2015 Ends: 31 March 2020 Value (£): 1,606,073
EPSRC Research Topic Classifications:
EPSRC Industrial Sector Classifications:
Electronics Information Technologies
Related Grants:
Panel History:
Panel DatePanel NameOutcome
04 Mar 2015 EPSRC QT Fellowships Interview Meeting 4-5 March 2015 Announced
Summary on Grant Application Form
Optical technologies are key to many communications, measurement and sensing tasks. In fact optical communication (in low loss fibres) underpins the global economy, supporting the near instantaneous transmission of terabits of information worldwide. However all-optical switching and computing have not developed dramatically despite optimism in the 1990's. This is primarily because of the problem of weak optical nonlinearity leading to high power requirements and low switching speeds. In this proposal I will develop a new optical switching technology based on the coupling of atom like defects in solid state hosts. The technology promises a high speed low power optical switch which could revolutionise all optical networks with routing and many other signal conditioning tasks performed in the all-optical domain.

The more recent developments of quantum photonic technologies such as quantum secured key distribution and the vision of quantum computing are also limited by the lack of a non-linearity at the single photon level. The missing component is in fact a deterministic entangler capable of inducing strong correlations between separate photons or between separate solid state realisations of quantum bits. This project aims to develop such gates based on our earlier invention a spin photon entangler which uses a singly charged quantum dot or colour centre strongly coupled to a microcavity. It turns out this element is a universal gate for quantum computation and experimental realisation of this gate is a key target here. Once such a component is available it will pave the way to a long range 'quantum internet' and to the development of a scalable quantum computer technology allowing both circuit and measurement based quantum computing realisations to be envisaged.

The end goal is to develop a technology that addresses both classical and quantum applications using single atom-like light emitters embedded in wavelength scale optical cavities (or waveguides) configured as either attojoule optical switches or high-fidelity efficient spin-photon entangling gates.

Key Findings
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Organisation Website: http://www.bris.ac.uk