Initialization of Single Spin Dressed States using Shortcuts to Adiabaticity.

We demonstrate the use of shortcuts to adiabaticity protocols for initialization, read-out, and coherent control of dressed states generated by closed-contour, coherent driving of a single spin. Such dressed states have recently been shown to exhibit efficient coherence protection, beyond what their two-level counterparts can offer. Our state transfer protocols yield a transfer fidelity of ∼99.4(2)% while accelerating the transfer speed by a factor of 2.6 compared to the adiabatic approach. We show bidirectionality of the accelerated state transfer, which we employ for direct dressed state population read-out after coherent manipulation in the dressed state manifold. Our results enable direct and efficient access to coherence-protected dressed states of individual spins and thereby offer attractive avenues for applications in quantum information processing or quantum sensing.

Probing magnetism in 2D materials at the nanoscale with single-spin microscopy.

The discovery of ferromagnetism in two-dimensional (2D) van der Waals (vdW) crystals has generated widespread interest. Making further progress in this area requires quantitative knowledge of the magnetic properties of vdW magnets at the nanoscale. We used scanning single-spin magnetometry based on diamond nitrogen-vacancy centers to image the magnetization, localized defects, and magnetic domains of atomically thin crystals of the vdW magnet chromium(III) iodide (CrI3). We determined the magnetization of CrI3 monolayers to be ≈16 Bohr magnetons per square nanometer, with comparable values in samples with odd numbers of layers; however, the magnetization vanishes when the number of layers is even. We also found that structural modifications can induce switching between ferromagnetic and antiferromagnetic interlayer ordering. These results demonstrate the benefit of using single-spin scanning magnetometry to study the magnetism of 2D vdW magnets.

Quantitative nanoscale vortex imaging using a cryogenic quantum magnetometer.

Microscopic studies of superconductors and their vortices play a pivotal role in understanding the mechanisms underlying superconductivity. Local measurements of penetration depths or magnetic stray fields enable access to fundamental aspects such as nanoscale variations in superfluid densities or the order parameter symmetry of superconductors. However, experimental tools that offer quantitative, nanoscale magnetometry and operate over large ranges of temperature and magnetic fields are still lacking. Here, we demonstrate the first operation of a cryogenic scanning quantum sensor in the form of a single nitrogen-vacancy electronic spin in diamond, which is capable of overcoming these existing limitations. To demonstrate the power of our approach, we perform quantitative, nanoscale magnetic imaging of Pearl vortices in the cuprate superconductor YBa2Cu3O7-δ. With a sensor-to-sample distance of ∼10 nm, we observe striking deviations from the prevalent monopole approximation in our vortex stray-field images, and find excellent quantitative agreement with Pearl's analytic model. Our experiments provide a non-invasive and unambiguous determination of the system's local penetration depth and are readily extended to higher temperatures and magnetic fields. These results demonstrate the potential of quantitative quantum sensors in benchmarking microscopic models of complex electronic systems and open the door for further exploration of strongly correlated electron physics using scanning nitrogen-vacancy magnetometry.

Subnanometre resolution in three-dimensional magnetic resonance imaging of individual dark spins.

Magnetic resonance imaging (MRI) has revolutionized biomedical science by providing non-invasive, three-dimensional biological imaging. However, spatial resolution in conventional MRI systems is limited to tens of micrometres, which is insufficient for imaging on molecular scales. Here, we demonstrate an MRI technique that provides subnanometre spatial resolution in three dimensions, with single electron-spin sensitivity. Our imaging method works under ambient conditions and can measure ubiquitous 'dark' spins, which constitute nearly all spin targets of interest. In this technique, the magnetic quantum-projection noise of dark spins is measured using a single nitrogen-vacancy (NV) magnetometer located near the surface of a diamond chip. The distribution of spins surrounding the NV magnetometer is imaged with a scanning magnetic-field gradient. To evaluate the performance of the NV-MRI technique, we image the three-dimensional landscape of electronic spins at the diamond surface and achieve an unprecedented combination of resolution (0.8 nm laterally and 1.5 nm vertically) and single-spin sensitivity. Our measurements uncover electronic spins on the diamond surface that can potentially be used as resources for improved magnetic imaging. This NV-MRI technique is immediately applicable to diverse systems including imaging spin chains, readout of spin-based quantum bits, and determining the location of spin labels in biological systems.

A clinical pathway for congestive heart failure.

This study has shown improved outcomes with the use of a clinical pathway. However, under PPS additional ways for coordination among healthcare providers and patients need to be developed to ensure improved care beyond those focusing on the use of the pathway. One recommendation is the use of telehealth.

Predictors of hospital readmission among the elderly with congestive heart failure.

This study compared elderly patients with congestive heart failure discharged from home healthcare to the home vs. those rehospitalized. The rate of rehospitalization in this sample of 117 was 27%. Significant predictors of rehospitalization included number of home healthcare days, number of previous hospitalizations, and the services of a home health aide. Implications include the timing and nature of home health visits.

Barriers for dissemination of a national health care data network. A list of recommendations for better dissemination.

Establishment of a Danish Nation-wide Health Care Data Network for exchange of health care related information using standardised EDIFACT messages is agreed between the Danish Government, the Hospital Owners and the GPs organisations. The aim is, within year 2000 in the MedCom project, to reach a level of 66% of all messages between the secondary and primary health sector must be send electronically using EDIFACT. There are many barriers for reaching this goal, and to reveal this barriers an investigation was done, and a list of recommendations are set up. The investigation was based upon literature, interviews and most important a questionnaire among 200 GPs and specialists all over the country. After 6 months where the recommendations have been handled there is seen an increase in communicated messages on 40%, and from January 1999 more than 1.1 mill messages are exchanged each month.

[Comparison of immunodiffusion and counterimmunoelectrophoresis for the detection of precipitating antibodies against Candida and Aspergillus antigens]. / Vergleich von Immundiffusion und Uberwanderungs-Elektrophorese zum Nachweis präzipierender Antikörper gegen Candida- und Aspergillus-Antigene.

Early diagnosis of disseminated fungal infections is a major problem in patients at risk, e.g. patients with malignancies or other severe illnesses. A number of serological tests for the detection of fungal antigens or antibodies can be performed in addition to culture methods. Valuable serological tests exist for the detection of precipitating antibodies to Candida sp. or Aspergillus sp. Precipitating antibodies against intracellular fungal antibodies can be detected by the immunodiffusion test (ID) or by counterimmunoelectrophoresis (CIE). In our study 103 patients' sera were examined in parallel with these two methods for antibodies against Candida sp. and 100 sera for antibodies against Aspergillus sp. The results indicate that counterimmunoelectrophoresis is more sensitive than immunodiffusion, and that the results of CIE also correlate better with elevated titers in other serological tests, e.g. the hemagglutination test or the immunofluorescence test. One of the limitations is that precipitating antibodies cannot be detected until relatively late in the course of infection. This disadvantage is further intensified by the long duration of performance of the immunodiffusion test in the laboratory. In comparison with the ID test, the detection of precipitating antibodies by counterimmunoelectrophoresis shortened the duration of performance in our laboratory by up to 5 days.

Dose-dependent effects of exogenous porcine somatotropin on the yield, distribution, and proximate composition of carcass tissues in growing pigs.

Dose-dependent effects of porcine somatotropin (pST) on mass, distribution, and proximate composition of carcass tissues were investigated in 46 growing pigs. Barrows, weighing 30 +/- 1 kg, were assigned to five treatment groups to receive 0, 50, 100, 150, or 200 micrograms of recombinant pST/kg BW per day until pigs individually reached the 90-kg slaughter weight. Left carcass sides were fabricated into whole-sale cuts that were separated into muscle, adipose tissue, bone, and skin. Despite the reduction in dressing percentage, total muscle mass of the side was significantly increased by 3.9 to 5.7 kg (28 to 36%) by the lowest and highest doses of pST, respectively, whereas adipose tissue mass was decreased by 4.4 to 8.6 kg (38 to 74%). Bone mass was increased by 8 to 27% (P < .05), and skin mass was increased by 16 to 38% (P < .01) across the dose range. Distribution of carcass weight among the wholesale cuts was altered by pST toward lower proportions in the belly, jowl, and fat trimmings and greater proportions in the four lean cuts. Porcine somatotropin substantially reduced lipid concentration in all muscle groups in a dose-dependent manner, resulting in increased protein and moisture concentrations (P < .05). Adipose tissue lipid concentrations were reduced to an even greater extent at each dose. The progressive increase in muscle mass observed with pST doses > 50 micrograms/kg BW was less than the associated decrease in adipose tissue mass, indicating that a dose range of 50 to 100 micrograms/kg BW per day may be optimum for improving carcass value.

Algorithms for detecting m-dimensional objects in N-dimensional spaces.

Exact and approximate algorithms for detecting lines in a two-dimensional image space are discussed. For the case of uniformly distributed noise within an image space, transform methods and different notions of probability measures governing the parameters of the transforms are described. It is shown that different quantization schemes of the transformed space are desirable for different probabilistic assumptions. The quantization schemes are evaluated and compared. For one of the procedures that uses a generalized Duda-Hart procedure and a mixed quantization scheme, the time complexity to find all m-flats in n-space is shown to be bounded by O(ptm(n-m)2), where p is the number of points and t is a user parameter. For this procedure more true flats in a given orientation have been found and the number of spurious flats is small.