Fibre Wavelength Quantum Light Sources

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The Sheffield team and the National Centre for III-V technologies will develop quantum dot single photon emitters forQuantum Communications. The overall project aims are to demonstrate the controlled emission of entangled photons froman LED structure emitting at a fibre-compatible wavelengths. Devices operating at this wavelength will be required toachieve commercially significant Quantum Communications technologies. There is a significant epitaxy challenge indeveloping this technology by Metal Organic Vapour Phase Epitaxy (MOVPE) at these wavelengths and there have beenno demonstrations of entangled LEDs to date.The Sheffield team will develop Indium Arsenide on Indium Phosphide quantum dots by MOVPE , complementing andcontrasting with the development by the Molecular Beam Epitaxy (MBE) method in the Cavendish laboratory. Todemonstrate single photon emitters at these wavelengths is challenging and there is a need to investigate the properties ofthe quantum dots by both techniques to understand how the quantum dots form and what controls the fundamentalproperties that will generate photon entanglement; including aspects such as the exciton spin splitting value. The work willbuild significantly on the prior work carried out at shorter wavelengths in Sheffield, Toshiba and Cavendish laboratoriesusing a different material system. In particular at Sheffield the result of quantum dot structures developed under an EPSRCProgramme Grant will benefit the project strongly since many of the physical properties may be similar. The demonstrationof high quality devices at this wavelength will be a significant milestone in matching Quantum Communications to thecurrent non-quantum fibre-communications infrastructure.