Abstract Trapped atomic ensembles are convenient systems for quantum information storage in the long-lived sublevels of electronic ground state and its conversion to propagating optical photons via stimulated Raman processes. Here we investigate a phase-matched emission from coherently prepared ensemble. We consider an ensemble cold atoms elongated harmonic trap with normal density distribution...

OBJECTIVE To develop a framework for understanding factors affecting the use of patient survey data in quality improvement. DESIGN Qualitative interviews with senior health professionals and managers and a review of the literature. SETTING A quality improvement collaborative in Minnesota, USA involving teams from eight medical groups, focusing on how to use patient survey data to improve pa...

OBJECTIVES To describe the development, cost effectiveness and implementation of a PDA based electronic system to collect, verify and manage data from a multi-site study on HIV/AIDS stigma and pregnancy in a rural, resource-poor area. METHODS We worked within a large prevention of mother-to-child-transmission (PMTCT) program in nine rural health facilities to implement a PDA-based data collec...

The Internet ooers unprecedented access to information. At present most of this information is free, but information providers are likely to start charging for their services in the near future. With that in mind this paper introduces the following information access problem: given a collection of n information sources, each of which has a known time delay, dollar cost and probability of provid...

BACKGROUND Over recent years there has been a strong movement towards the improvement of vital statistics and other types of health data that inform evidence-based policies. Collecting such data is not cost free. To date there is no systematic framework to guide investment decisions on methods of data collection for vital statistics or health information in general. We developed a framework to ...