Optimal measurements for relative quantum information

We provide optimal measurement schemes for estimating relative parameters of the quantum state of a pair of spin systems. We prove that the optimal measurements are joint measurements on the pair of systems, meaning that they cannot be achieved by local operations and classical communication. We also demonstrate that in the limit where one of the spins becomes macroscopic, our results reproduce those that are obtained by treating that spin as a classical reference direction.Comment: 6 pages, 1 figure, published versio

Axial Multicentric Osteosarcoma in an English Cocker Spaniel

No abstract available

Can a Lattice String Have a Vanishing Cosmological Constant?

We prove that a class of one-loop partition functions found by Dienes, giving rise to a vanishing cosmological constant to one-loop, cannot be realized by a consistent lattice string. The construction of non-supersymmetric string with a vanishing cosmological constant therefore remains as elusive as ever. We also discuss a new test that any one-loop partition function for a lattice string must satisfy.Comment: 14 page

Building Their Stories: Electronic Case Studies of Struggling Readers

Ten university graduate students created electronic case studies describing the learning of struggling readers as a part of this study designed to yield insights about literacy education and the efficacy of electronic case study development. A variety of data, analyzed through a qualitative content analysis, revealed understandings regarding participants\u27 perceptions about themselves as learners, ideas about their influences on students, and revelations about literacy instruction. A final theme revealed that, as participants reflected upon their own learning; they also voiced a commitment to literacy teaching that went beyond their personal classroom settings. Further, researchers gained insights about how to better prepare literacy educators, as well as how to more effectively integrate technology into the case study process

Psychological models of sporting injury: Janos Selye revisited

A recent model, the Cumulative Stress and Training Continuum Model, emphasizes the complex interactions between psychological, social and physical factors. Such an approach helps to explain how apparently non-significant factors can exert disproportionate effects on injury risk in high stress states. This presentation synthesises psychological models of injury into the same framework and explains some of the processes leading to sport injuries and syndromes characterised by unexplained underperformance. Injury in sport is something of an occupational hazard, with a reported annual incidence among athletes of 30% – 70%. Many injuries are due to human error and/or overload of performance capacities, and are therefore preventable. Most of the models draw directly or indirectly on Selye’s General Adaptation Theory, although the lax use of terminology frequently obscures this. The unique contribution of the present synthesis is that, being inclusive and holistic, it provides a unifying paradigm for research and application. To address the high incidence of injuries among athletes at the Queensland Academy of Sport, a Cognitive-Behavioural Stress Management program has been developed and is being tested. The program teaches stress management skills, including breathing optimisation, muscular relaxation, cognitive restructuring, plus recovery-related and performance-related imagery. The program is introduced over a two-week period and is also provided on MP3 players for daily utilisation. Athletes are monitored over a 10-week period using salivary cortisol and psychometric measures of perceived stress, life events, mood, and stress recovery. Injury characteristics and time lost from planned training is recorded. Pilot results will be presented

Mach-Zehnder Interferometry in a Strongly Driven Superconducting Qubit

We demonstrate Mach-Zehnder-type interferometry in a superconducting flux qubit. The qubit is a tunable artificial atom, whose ground and excited states exhibit an avoided crossing. Strongly driving the qubit with harmonic excitation sweeps it through the avoided crossing two times per period. As the induced Landau-Zener transitions act as coherent beamsplitters, the accumulated phase between transitions, which varies with microwave amplitude, results in quantum interference fringes for n=1...20 photon transitions. The generalization of optical Mach-Zehnder interferometry, performed in qubit phase space, provides an alternative means to manipulate and characterize the qubit in the strongly-driven regime.Comment: 14 pages, 6 figure

Computation Research

Contains reports on three research projects.Joint Services Electronics Programs (U.S. Army, U.S. Navy, and U.S. Air Force) under Contract DA 28-043-AMC-02536(E

Kinematic Evidence of an Embedded Protoplanet in HD 142666 Identified by Machine Learning

Observations of protoplanetary disks have shown that forming exoplanets leave characteristic imprints on the gas and dust of the disk. In the gas, these forming exoplanets cause deviations from Keplerian motion, which can be detected through molecular line observations. Our previous work has shown that machine learning can correctly determine if a planet is present in these disks. Using our machine learning models, we identify strong, localized non-Keplerian motion within the disk HD 142666. Subsequent hydrodynamics simulations of a system with a 5 Jupiter-mass planet at 75 au recreates the kinematic structure. By currently established standards in the field, we conclude that HD 142666 hosts a planet. This work represents a first step towards using machine learning to identify previously overlooked non-Keplerian features in protoplanetary disks.Comment: 7 pages, 3 figures, 1 table. Accepted to Ap

Evidence for quantum confinement in the photoluminescence of porous Si and SiGe

We have used anodization techniques to process porous surface regions in p-type Czochralski Si and in p-type Si0.85Ge0.15 epitaxial layers grown by molecular beam epitaxy. The SiGe layers were unrelaxed before processing. We have observed strong near-infrared and visible light emission from both systems. Analysis of the radiative and nonradiative recombination processes indicate that the emission is consistent with the decay of excitons localized in structures of one or zero dimensions