Experimental Proof of Quantum Nonlocality without Squeezing

It is shown that the ensemble $\{p (\alpha),|\alpha>|\alpha^*>\}$ where $p (\alpha)$ is a Gaussian distribution of finite variance and $| \alpha>$ is a coherent state can be better discriminated with an entangled measurement than with any local strategy supplemented by classical communication. Although this ensemble consists of products of quasi-classical states, it exhibits some quantum nonlocality. This remarkable effect is demonstrated experimentally by implementing the optimal local strategy together with a joint nonlocal strategy that yields a higher fidelity.Comment: 4 pages, 2 figure

Protecting Quantum Information with Entanglement and Noisy Optical Modes

We incorporate active and passive quantum error-correcting techniques to protect a set of optical information modes of a continuous-variable quantum information system. Our method uses ancilla modes, entangled modes, and gauge modes (modes in a mixed state) to help correct errors on a set of information modes. A linear-optical encoding circuit consisting of offline squeezers, passive optical devices, feedforward control, conditional modulation, and homodyne measurements performs the encoding. The result is that we extend the entanglement-assisted operator stabilizer formalism for discrete variables to continuous-variable quantum information processing.Comment: 7 pages, 1 figur

A framework for bounding nonlocality of state discrimination

We consider the class of protocols that can be implemented by local quantum operations and classical communication (LOCC) between two parties. In particular, we focus on the task of discriminating a known set of quantum states by LOCC. Building on the work in the paper "Quantum nonlocality without entanglement" [BDF+99], we provide a framework for bounding the amount of nonlocality in a given set of bipartite quantum states in terms of a lower bound on the probability of error in any LOCC discrimination protocol. We apply our framework to an orthonormal product basis known as the domino states and obtain an alternative and simplified proof that quantifies its nonlocality. We generalize this result for similar bases in larger dimensions, as well as the "rotated" domino states, resolving a long-standing open question [BDF+99].Comment: 33 pages, 7 figures, 1 tabl

The state of professionalisation of midwifery in Belgium: A discussion paper.

AIM: To describe the state of the professionalisation of midwifery in Belgium, and to formulate recommendations for advancing the midwifery profession. METHODS: A descriptive overview of maternity care in Belgium and the professionalisation of midwifery through an analysis of relevant policy and academic texts, underpinned by Greenwood's sociological criteria for a profession: (1) own body of knowledge, (2) recognised authority, (3) broader community sanctions, (4) own code of ethics and (5) professional culture sustained by formal professional associations. From these insights, recommendations for advancing the midwifery profession in Belgium are formulated. FINDINGS: Current strengths of the professionalisation of midwifery in Belgium included unified midwifery education programmes, progress in midwifery research and overarching national documents for guiding midwifery education, practice and regulation. In contrast however challenges, such as the limited recognition of midwives' roles by its clientele, limitations of midwives' competencies and autonomy, lacking development of advanced roles in maternity care practice and a lack of unity of the organisation and its members, were also identified. Based on these, recommendations are made to strengthen Belgian midwifery. CONCLUSIONS: Recommendations for advancing the midwifery profession in Belgium includes in particular increasing public awareness of midwives' roles and competencies, implementing the full scope of midwifery practice and monitoring and advancing this practice. Thus, professional autonomy over both midwifery practice and working conditions should be enhanced. United midwifery organisations, together with women's groups, other maternity care professionals and policy-makers as equal partners are key to bring about changes in the Belgian maternity care landscape

Quantum Correlations in NMR systems

In conventional NMR experiments, the Zeeman energy gaps of the nuclear spin ensembles are much lower than their thermal energies, and accordingly exhibit tiny polarizations. Generally such low-purity quantum states are devoid of quantum entanglement. However, there exist certain nonclassical correlations which can be observed even in such systems. In this chapter, we discuss three such quantum correlations, namely, quantum contextuality, Leggett-Garg temporal correlations, and quantum discord. In each case, we provide a brief theoretical background and then describe some results from NMR experiments.Comment: 21 pages, 7 figure

Character of superposed states under deterministic LOCC

In this paper we investigate the effect of superposition of states on local conversion of pure bipartite states under deterministic LOCC. We are able to form a bridge between comparable and incomparable classes of states through the linear superposition of states. For example, if we consider two pairs of incomparable states, then their superposition may result into a comparable pair of states. We investigate many such cases and provide some of the results in tabular form. We also investigate the entanglement behavior of such classes of states, specifically their monotone nature. Finally we provide some bounds of different measures of entanglement based on the idea of comparability and incomparability under deterministic LOCC.Comment: 9 pages, pdflatex, no figure, to appear in the journal Quantum Information Processin

Renal responses to exercise in heart and kidney transplant patients

There is a lack of information about renal responses in heart and kidney transplant patients after intense physical exercise. Eleven heart and ten kidney trans plant recipients, as well as two control groups of healthy subjects, were given a maximum exercise test on a bicycle ergometer. One control group was also given a moderate load corresponding to the peak load of the kidney transplant group. Blood and urine samples were collected before and after exercise and assayed for lactate, creatinine, total protein, and albumin. The glomerular filtration rate remained stable at the end of exercise in the transplant patients, while there was a slight (17%) decrease in the control group. Albumin excretion rates after maximum exercise attained a mean of 237 μg min-1 in the control group and a mean of 45 and 16 μg min-1 respectively, in the heart and kidney groups. Postexercise proteinuria seemed to be related to the absolute intensity of the event, but kidney transplant patients showed a reduced effect as compared to heart transplant patients. We conclude that short-term, maximum exercise in heart and kidney transplant recipients is not detrimental to kidney function.SCOPUS: ar.jFLWINinfo:eu-repo/semantics/publishe

Increased platelet aggregability and prostacyclin biosynthesis induced by intense physical exercise.

Changes in platelet aggregability during maximal bicycle ergometry were studied in healthy untrained subjects. Ex vivo platelet aggregation in response to ADP and collagen was measured in whole blood by impedance aggregometry or by direct electronic counting in an Ultra-Flo 100 platelet counter. This last method revealed that the platelet aggregation induced by low concentration of ADP (0.5 - 1.0 microM) was significantly enhanced during exercise. The plasma level of beta-thromboglobulin and the urinary excretion of 2,3--dinor-6-keto prostaglandin F1 alpha were also increased. These data indicate that an intense physical exercise enhances the aggregability of human platelets and induces a compensatory increase in prostacyclin biosynthesis.Journal ArticleResearch Support, Non-U.S. Gov'tinfo:eu-repo/semantics/publishe