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Entangled photon pairs are an important resource in quantum optics, and are essential for quantum information applications such as quantum key distribution and controlled quantum logic operations. The radiative decay of biexcitons-that is, states consisting of two bound electron-hole pairs-in a quantum dot has been proposed as a source of triggered(More)
  • Cheri Grace, Hannah Kettler, Paul Wilson, Owen Barder, Chad Gardner, Adrian Towse +3 others
  • 2006
The DFID Health Resource Centre (HRC) provides technical assistance and information to the British Government's Department for International Development (DFID) and its partners in support of pro-poor health policies, financing and services.
BACKGROUND Children with epilepsy are at increased risk for behavioral and psychiatric disorders and it has been recommended that all children with epilepsy be screened for such conditions. There is thus a need to identify appropriate screening measures in this population. METHODS Children with active epilepsy (on AEDs and/or had a seizure in the last(More)
The lack of structural symmetry which usually characterizes semiconductor quantum dots lifts the energetic degeneracy of the bright excitonic states and hampers severely their use as high-fidelity sources of entangled photons. We demonstrate experimentally and theoretically that it is always possible to restore the excitonic degeneracy by the simultaneous(More)
Childhood epilepsy is associated with a range of neurobehavioural comorbidities including Attention-Deficit/Hyperactivity Disorder (ADHD), Autism Spectrum Disorder (ASD), motor impairments and emotional problems. These difficulties frequently have a greater impact on quality of life than seizures. Pathological Demand Avoidance (PDA) is a term increasingly(More)
INTRODUCTION There is a lack of population-based data on specific cognitive profiles in childhood epilepsy. This study sought to determine the frequency of impairments in global cognition and aspects of working memory and processing speed in a population-based sample of children with "active" epilepsy (on antiepileptic Drugs (AEDs), and/or had a seizure in(More)
At the end of 2003, the Journal of the Royal Society of Medicine published an article announcing the creation of the James Lind Initiative (JLI). 1 The article began by recalling the way that James Lind, an 18th century Scottish naval surgeon, had confronted uncertainty about how to treat scurvy by doing a controlled trial. This had shown that oranges and(More)
OBJECTIVE To provide population-based data on the performance of school-aged children with epilepsy on measures of academic achievement and factors associated with this performance after controlling for IQ. METHODS Eighty-five (74%) of 115 children with "active" epilepsy (experienced a seizure in the past year and/or on antiepileptic drugs [AEDs])(More)
In a defined geographical area in the south of the UK, 115 children with active epilepsy (i.e., children who had seizures in the last year and/or children who were taking antiepileptic drugs (AEDs)) were identified via a computerized database and liaison with local pediatricians. Eighty-five (74%) of the children (5-15years of age) underwent a comprehensive(More)
We demonstrate up to 30 nm tuning of gallium phosphide photonic crystal cavities resonances at ~1.5 µm using a tapered optical fiber. The tuning is achieved through a combination of near-field perturbations and mechanical deformation of the membrane, both induced by the fiber probe. By exploiting this effect, we show fiber-coupled second harmonic generation(More)