Entanglement entropy and the determination of an unknown quantum state

An initial unknown quantum state can be determined with a single measurement apparatus by letting it interact with an auxiliary, "Ancilla", system as proposed by Allahverdyan, Balian and Nieuwenhuizen [Phys. Rev. Lett. 92, 120402 (2004)]. In the case of two qubits, this procedure allows to reconstruct the initial state of the qubit of interest S by measuring three commuting observables and therefore by means of a single apparatus, for the total system S + A at a later time. The determinant of the matrix of the linear transformation connecting the measurements of three commuting observables at time t > 0 to the components of the polarization vector of S at time t = 0 is used as an indicator of the reconstructability of the initial state of the system S. We show that a connection between the entanglement entropy of the total system S + A and such a determinant exists, and that for a pure state a vanishing entanglement individuates, without a need for any measurement, those intervals of time for which the reconstruction procedure is least efficient. This property remains valid for a generic dimension of S. In the case of a mixed state this connection is lost.Comment: 5 pages 2 figures, accepted for publication on Physical Review

Early childhood nutrition and anaemia prevention project: summary report June 2013

This report summarises and evaluates a program of preventive multi-micronutrient supplementation, peer-counselling and nutrition promotion that was piloted in six remote northern Australian Aboriginal communities. Introduction The Early Childhood Nutrition and Anaemia Prevention Project (ECNAPP) was implemented in six remote communities, four in the Northern Territory (NT), one in Cape York in Queensland (Qld) and one in the East Kimberley region in Western Australia (WA). Project planning and development commenced in 2006, with project activities occurring between 2010 and 2012. T his report summarises the project development, program implementation, results of the evaluation of both project processes and outcomes, and provides recommendations for future policy, programs and research addressing infant and young child nutrition and anaemia in northern Australia.   Authored by Danielle Aquino, Julia V Marley, Kate Senior, Dympna Leonard, Angelina Joshua, Amelia Huddleston, Heather Ferguson, Janet Helmer, Nyssa Hadgraft and Vivienne Hobson