Protecting Two-Qubit Quantum States by π\pi-Phase Pulses

We study the state decay of two qubits interacted with a common harmonic oscillator reservoir. There are both decoherence error and the error caused by the amplitude change of the superradiant state. We show that frequent $\pi$-phase pulses can eliminate both typpes of errors therefore protect a two-qubit odd-parity state more effectively than the frequent measurement method. This shows that the the methods using dynamical decoupling and the quantum Zeno effects actually can give rather {\em different} results when the operation frequency is finite

Strong cosmic censorship for the massless Dirac field in the Reissner-Nordstrom-de Sitter spacetime

We present the Fermi story of strong cosmic censorship in the near-extremal Reissner-Nordstrom-de Sitter black hole. To this end, we first derive from scratch the criterion for the quasi-normal modes of Dirac field to violate strong cosmic censorship in such a background, which turns out to be exactly the same as those for Bose fields, although the involved energy momentum tensor is qualitatively different from that for Bose fields. Then to extract the low-lying quasi-normal modes by Prony method, we apply Crank-Nicolson method to evolve our Dirac field in the double null coordinates. As a result, it shows that for a fixed near-extremal black hole, strong cosmic censorship can be recovered by the $l=\frac{1}{2}$ black hole family mode once the charge of our Dirac field is greater than some critical value, which is increased as one approaches the extremal black hole.Comment: JHEP published versio

History of diabetes mellitus is associated with elevated cardiac troponin I levels in patients with chest pain but no coronary heart disease

Background: The factors and the mechanism contributing to an increase in cardiac troponin I (cTnI) in patients with chest pain, at least one cardiovascular risk factor, and no evidence of coronary heart disease remains elusive. Methods: Excluding patients with acute coronary syndrome and chronic myocardial isch­emia, we selected 362 consecutive patients with normal coronary angiography or computed tomography coronary angiography results or lesions causing < 50% stenosis in any of the coronary arteries from January 2012 to June 2015. Using a cut-off value of 0.01 ng/mL, patients with cTnI levels ≥ 0.01 ng/mL (164 patients) were compared with those with cTnI levels < 0.01 ng/mL. Logistic regression analysis was used to evaluate associations between elevated cTnI and patient characteristics. Results: Other than history of diabetes mellitus (DM) (18.90% vs. 8.08%, p = 0.002), the characteristics of the patients with and without elevated cTnI levels were similar. History of DM predicted elevation of cTnI level (OR 3.34, 95% CI 1.55–7.20, p = 0.002) in logistic regression analysis. Conclusions: In total, 45.30% of patients with chest pain had elevated cTnI levels with a mean level of 0.07 ± 0.10 ng/mL. History of DM rather than blood glucose level itself was associated with elevated cTnI levels, whereas female gender was protective against increases in cTnI levels.

The Holographic dark energy reexamined

We have reexamined the holographic dark energy model by considering the spatial curvature. We have refined the model parameter and observed that the holographic dark energy model does not behave as phantom model. Comparing the holographic dark energy model to the supernova observation alone, we found that the closed universe is favored. Combining with the Wilkinson Microwave Anisotropy Probe (WMAP) data, we obtained the reasonable value of the spatial curvature of our universe.Comment: divided into sections, add one figure, some typos corrected, references added, Accepted for publication in PRD; v3: some typos corrected, title change

Entanglement distribution maximization over one-side Gaussian noisy channel

The optimization of entanglement evolution for two-mode Gaussian pure states under one-side Gaussian map is studied. Even there isn't complete information about the one-side Gaussian noisy channel, one can still maximize the entanglement distribution by testing the channel with only two specific states

Temperature-controlled electrospinning of EVOH nanofibre mats encapsulated with Ag, CuO, and ZnO particles for skin wound dressing

To treat skin burns, a new wound dressing, nanofibre mats with metal or metal oxide nanoparticles (Ag, CuO, and ZnO), was fabricated using the electrospinning technique. During a therapeutic process, the antibacterial ability and bio-compatibility of a new dressing material are of major concern. To expound the characteristics of ethylene vinyl alcohol (EVOH) nanofibre mats encapsulated with metal or metal oxide nanoparticles, denoted as Ag-EVOH, CuO-EVOH, and ZnO-EVOH, for use as new wound dressing materials, we investigated the suitable processing parameters to fabricate these materials, such as the voltage, tip-to-collector distance, concentration of the solution, and effect of environmental temperature. The antibacterial ability and bio-compatibility of Ag-EVOH, CuO-EVOH, and ZnO-EVOH were then tested and quantified. The outcomes show that the most suitable temperature for the fabrication of the materials is 40 °C (±3 °C). The antibacterial experiment results indicate that 0.08 g/ml of metal/metallic oxide shows the highest antibacterial ability toward Staphylococcus aureus. Furthermore, the largest diameters of the bacteriostatic loops of the three types of nanofibre mats, i.e. Ag-EVOH, CuO-EVOH, and ZnO-EVOH, are 5.89, 5.21, and 4.12 mm, respectively. Finally, the cell proliferations on the three nanofibre mats show a similar growth trend