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Details of Grant 

EPSRC Reference: EP/M508275/1
Title: Fibre Wavelength Quantum Light Sources
Principal Investigator: Heffernan, Professor J
Other Investigators:
Researcher Co-Investigators:
Project Partners:
Department: Electronic and Electrical Engineering
Organisation: University of Sheffield
Scheme: Technology Programme
Starts: 01 July 2015 Ends: 31 December 2016 Value (£): 100,479
EPSRC Research Topic Classifications:
EPSRC Industrial Sector Classifications:
Related Grants:
EP/M508263/1
Panel History:  
Summary on Grant Application Form
The Sheffield team and the National Centre for III-V technologies will develop quantum dot single photon emitters for

Quantum Communications. The overall project aims are to demonstrate the controlled emission of entangled photons from

an LED structure emitting at a fibre-compatible wavelengths. Devices operating at this wavelength will be required to

achieve commercially significant Quantum Communications technologies. There is a significant epitaxy challenge in

developing this technology by Metal Organic Vapour Phase Epitaxy (MOVPE) at these wavelengths and there have been

no demonstrations of entangled LEDs to date.

The Sheffield team will develop Indium Arsenide on Indium Phosphide quantum dots by MOVPE , complementing and

contrasting with the development by the Molecular Beam Epitaxy (MBE) method in the Cavendish laboratory. To

demonstrate single photon emitters at these wavelengths is challenging and there is a need to investigate the properties of

the quantum dots by both techniques to understand how the quantum dots form and what controls the fundamental

properties that will generate photon entanglement; including aspects such as the exciton spin splitting value. The work will

build significantly on the prior work carried out at shorter wavelengths in Sheffield, Toshiba and Cavendish laboratories

using a different material system. In particular at Sheffield the result of quantum dot structures developed under an EPSRC

Programme Grant will benefit the project strongly since many of the physical properties may be similar. The demonstration

of high quality devices at this wavelength will be a significant milestone in matching Quantum Communications to the

current non-quantum fibre-communications infrastructure.
Key Findings
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Potential use in non-academic contexts
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Summary
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Organisation Website: http://www.shef.ac.uk