A simple operational interpretation of the fidelity

This note presents a corollary to Uhlmann's theorem which provides a simple operational interpretation for the fidelity of mixed states.Comment: 1 pag

Informing early intervention: preschool predictors of anxiety disorders in middle childhood

Background: To inform early intervention practice, the present research examines how child anxiety, behavioural inhibition, maternal overinvolvement, maternal negativity, mother-child attachment and maternal anxiety, as assessed at age four, predict anxiety at age nine. Method: 202 children (102 behaviourally inhibited and 100 behaviourally uninhibited) aged 3–4 years were initially recruited and the predictors outlined above were assessed. Diagnostic assessments, using the Anxiety Disorders Interview Schedule, were then conducted five years later. Results: Behavioural inhibition, maternal anxiety, and maternal overinvolvement were significant predictors of clinical anxiety, even after controlling for baseline anxiety (p,.05). No significant effect of negativity or attachment security was found over and above baseline anxiety (p..1). Conclusions: Preschool children who show anxiety, are inhibited, have overinvolved mothers and mothers with anxiety disorders are at increased risk for anxiety in middle childhood. These factors can be used to identify suitable participants for early intervention and can be targeted within intervention programs

Fast D-bar reconstructions of ventilation and perfusion on a pairwise current injection system

A fast implementation of the D-bar method for reconstructing conductivity changes on a 2-D chest-shaped domain is described. Cross-sectional difference images of ventilation and perfusion in a healthy human subject are presented. The images constitute the first D-bar images from EIT data on a human subject collected on a pairwise current injection system

Fast D-bar reconstructions of ventilation and perfusion on a pairwise current injection system

Abstract: A fast implementation of the D-bar method for reconstructing conductivity changes on a 2-D chest-shaped domain is described. Cross-sectional difference images of ventilation and perfusion in a healthy human subject are presented. The images constitute the first D-bar images from EIT data on a human subject collected on a pairwise current injection system

Three-Year Longitudinal Service-Learning Research Study: Preliminary Findings

Using an experimental design, this study examines the contributions of service-learning to decreased at-risk behaviors, student cognitive, social, and personal development, and academic achievement over a three-year period. During the pilot phase and Years One and Two, teachers and students from eleven different Ohio schools have been surveyed. Preliminary findings are presented

Longitudinal investigation of the role of temperament and stressful life events in childhood anxiety

The current study investigated the longitudinal relationships between BI, life events, and anxiety in a sample of 102 behaviourally inhibited (BI) and 100 uninhibited (BUI) children aged 3 to 4 years. Children’s parents completed questionnaires on BI, stressful life events, and anxiety symptoms, and were administered a diagnostic interview three times in a 5-year period. In line with our hypotheses, negative life events, and negative behaviour- dependent life events (i.e. life events that are related to the children’s own behaviours) in particular, and the impact of negative life events, were predictive of increases in subsequent anxiety symptoms, the likelihood of having an anxiety disorder, and increased number of anxiety diagnoses over the five year follow-up period. Experiencing more positive, behaviour-independent life events decreased the risk of being diagnosed with an anxiety disorder. Furthermore, differences were found in life events between BI and BUI children. That is, BI children experienced fewer positive and specifically positive behaviour-dependent life events, and the impact of these positive life events was also lower in BI children than in BUI children. However, BI did not interact with life events in the prediction of anxiety problems as hypothesized. Therefore, this study seems to indicate that BI and life events act as additive risk factors in the development of anxiety problems

A practical scheme for quantum computation with any two-qubit entangling gate

Which gates are universal for quantum computation? Although it is well known that certain gates on two-level quantum systems (qubits), such as the controlled-not (CNOT), are universal when assisted by arbitrary one-qubit gates, it has only recently become clear precisely what class of two-qubit gates is universal in this sense. Here we present an elementary proof that any entangling two-qubit gate is universal for quantum computation, when assisted by one-qubit gates. A proof of this important result for systems of arbitrary finite dimension has been provided by J. L. and R. Brylinski [arXiv:quant-ph/0108062, 2001]; however, their proof relies upon a long argument using advanced mathematics. In contrast, our proof provides a simple constructive procedure which is close to optimal and experimentally practical [C. M. Dawson and A. Gilchrist, online implementation of the procedure described herein (2002), http://www.physics.uq.edu.au/gqc/].Comment: 3 pages, online implementation of procedure described can be found at http://www.physics.uq.edu.au/gqc

Universal quantum computation and simulation using any entangling Hamiltonian and local unitaries

What interactions are sufficient to simulate arbitrary quantum dynamics in a composite quantum system? We provide an efficient algorithm to simulate any desired two-body Hamiltonian evolution using any fixed two-body entangling n-qubit Hamiltonian and local unitaries. It follows that universal quantum computation can be performed using any entangling interaction and local unitary operations.Comment: Added references to NMR refocusing and to earlier work by Leung et al and Jones and Knil

The efficacy of interventions for behaviourally inhibited preschool-aged children: A meta-analysis

The current systematic review and meta-analyses examined the efficacy of psychological interventions targeting behavioural inhibition and anxiety in preschool-aged children, evaluated within randomised controlled trials. Web of Science, MEDLINE, PsycINFO and CINAHL were systematically searched from inception to March 2021. Ten studies (N = 1475 children, aged 3 – 7 years) were included in the current review. Separate analyses were conducted for behavioural inhibition, anxiety symptoms, and anxiety diagnosis as reported by parents, teachers, and observer-ratings. Pooled outcomes ranged from post-intervention to 12-month follow-up due to the limited number of studies. Meta-analyses revealed that intervention did not reduce behavioural inhibition as assessed by independent observers (SMD = -.13, 95% CI = -.63 to.38), but did reduce behavioural inhibition as reported by parents (SMC = -.64, 95% CI = -1.00 to -.27) and teachers (SMD = -.69, 95% CI = -1.02 to -.36). Additionally, intervention appeared to reduce the risk of anxiety disorders (RR =.75, 95% CI =.62 to.90), and parent-report anxiety symptoms (SMC = -.47, 95% CI = -.83 to -.12) in preschool-aged children. Intervention may be efficacious in reducing anxiety in preschool-aged behaviourally inhibited children. It is less clear whether intervention leads to change in BI