By contacting all the μLEDs, the researchers could perform a bulk analysis across approximately 1,300 μLEDs, but did not discard the possibility to control those μLEDs individually for better performance selectivity and to compensate for process inhomogeneity.
Ideally, for quantum information processing, they would like to use the μLEDs as perfectly indistinguishable sources of entangled-photons. Photon extraction efficiency was fairly low too, at around 1%, something the researchers ought to be improving using various tricks of the trade (including built-in material strain and electric fields).
Dr Emanuele Pelucchi, Head of Epitaxy and Physics of Nanostructures and a member of the Science Foundation Ireland-funded Irish Photonic Integration Centre (IPIC) at Tyndall National Institute in Cork sees his team's results as key steps towards the realisation of integrated quantum photonic circuits for quantum computing processing tasks.
Visit the Tyndall National Institute at www.tyndall.ie