High-Fidelity and Ultrafast Initialization of a Hole Spin Bound to a Te Isoelectronic Center in ZnS

We demonstrate the optical initialization of a hole-spin qubit bound to an isoelectronic center (IC) formed by a pair of Te impurities in ZnSe, an impurity/host system providing high optical homogeneity, large electric dipole moments, and long coherence times. The initialization scheme is based on the spin-preserving tunneling of a resonantly excited donor-bound exciton to a positively charged Te IC, thus forming a positive trion. The radiative decay of the trion within less than 50 ps leaves a heavy hole in a well-defined polarization-controlled spin state. The initialization fidelity exceeds 98:5 % for an initialization time of less than 150 ps.Comment: 5 pages, 3 figures, 1 supplemental information sectio

La représentation contemporaine du corps comme allégorie de la société

La conception du corps individuel peut être considérée comme une allégorie du corps social. C’est à ce titre que nous essaierons de démontrer que les idées qui ont cours sur le corps individuel reflètent celles qui ont cours à propos de la société en général. De cette manière, le corps apparaît comme un site de représentation du social. Dans cette perspective, nous défendrons l’hypothèse que la dématérialisation partielle du corps semble indiquer une véritable métamorphose de la dynamique sociétale contemporaine, et en même temps la symbolisation d’une nouvelle représentation sociétale du corps. Au coeur de cette problématique, nous considérerons le double processus de la naturalisation de la culture et de la culturalisation de la nature.The conception of the individual body can be seen as an allegory of the social body. In this article, we seek to demonstrate the parallels between ideas about the individual body and that of society in general, such that the body appears as a site for representing the social. Our hypothesis is one of a partial dematerialisation of the body that seems to indicate a real metamorphosis of the contemporary social dynamic and at the same time symbolises a new societal representation of the body. The heart of the question is a double process of naturalisation of culture and culturalisation of nature

Reducing variability in along-tract analysis with diffusion profile realignment

Diffusion weighted MRI (dMRI) provides a non invasive virtual reconstruction of the brain's white matter structures through tractography. Analyzing dMRI measures along the trajectory of white matter bundles can provide a more specific investigation than considering a region of interest or tract-averaged measurements. However, performing group analyses with this along-tract strategy requires correspondence between points of tract pathways across subjects. This is usually achieved by creating a new common space where the representative streamlines from every subject are resampled to the same number of points. If the underlying anatomy of some subjects was altered due to, e.g. disease or developmental changes, such information might be lost by resampling to a fixed number of points. In this work, we propose to address the issue of possible misalignment, which might be present even after resampling, by realigning the representative streamline of each subject in this 1D space with a new method, coined diffusion profile realignment (DPR). Experiments on synthetic datasets show that DPR reduces the coefficient of variation for the mean diffusivity, fractional anisotropy and apparent fiber density when compared to the unaligned case. Using 100 in vivo datasets from the HCP, we simulated changes in mean diffusivity, fractional anisotropy and apparent fiber density. Pairwise Student's t-tests between these altered subjects and the original subjects indicate that regional changes are identified after realignment with the DPR algorithm, while preserving differences previously detected in the unaligned case. This new correction strategy contributes to revealing effects of interest which might be hidden by misalignment and has the potential to improve the specificity in longitudinal population studies beyond the traditional region of interest based analysis and along-tract analysis workflows.Comment: v4: peer-reviewed round 2 v3 : deleted some old text from before peer-review which was mistakenly included v2 : peer-reviewed version v1: preprint as submitted to journal NeuroImag

Why they kill : criminal etiologies in Mary Shelley's Frankenstein, R.L. Stevenson's Strange case of Dr Jekyll and Mr Hyde, and Oscar Wilde's The picture of Dorian Gray

Mémoire numérisé par la Division de la gestion de documents et des archives de l'Université de Montréal.[À l'origine dans / Was originally part of : Thèses et mémoires - FAS - Département d'études anglaises

The Role of Simple Rules in the Conduct of Canadian Monetary Policy

The third strategy employed by the Bank when dealing with uncertainty is the consideration of appropriate simple reaction functions or "rules" for the setting of the policy interest rate. Since John Taylor's presentation of his much-discussed rule, research on simple policy rules has exploded. Simple rules have several advantages. In particular, they are easy to construct and communicate and are believed by some to be robust, in the sense of generating good results in a variety of economic models. This article provides an overview of the recent research regarding the usefulness and robustness of simple monetary policy rules, particularly in models of the Canadian economy. It also describes and explains the role of simple rules in the conduct of monetary policy in Canada.