Non-Markovian entanglement dynamics in coupled superconducting qubit systems

We theoretically analyze the entanglement generation and dynamics by coupled Josephson junction qubits. Considering a current-biased Josephson junction (CBJJ), we generate maximally entangled states. In particular, the entanglement dynamics is considered as a function of the decoherence parameters, such as the temperature, the ratio $r\equiv\omega_c/\omega_0$ between the reservoir cutoff frequency $\omega_c$ and the system oscillator frequency $\omega_0$, % between $\omega_0$ the characteristic frequency of the %quantum system of interest, and $\omega_c$ the cut-off frequency of %Ohmic reservoir and the energy levels split of the superconducting circuits in the non-Markovian master equation. We analyzed the entanglement sudden death (ESD) and entanglement sudden birth (ESB) by the non-Markovian master equation. Furthermore, we find that the larger the ratio $r$ and the thermal energy $k_BT$, the shorter the decoherence. In this superconducting qubit system we find that the entanglement can be controlled and the ESD time can be prolonged by adjusting the temperature and the superconducting phases $\Phi_k$ which split the energy levels.Comment: 13 pages, 3 figure

On the antioxidant activity of melatonin

Melatonin has been widely reported to be an effective antioxidant. Studies of its ability to inhibit the autoxidation of lipids in homogeneous solution and in model heterogeneous systems show that melatonin is not a peroxyl radical trapping antioxidant. In contrast, melatonin can inhibit metal ion-catalyzed oxidation processes.Peer reviewed: YesNRC publication: Ye

Longitudinal test-retest neuroimaging data from healthy young adults in southwest China

Multimodal magnetic resonance imaging (mMRI) has been widely used to map the structure and function of the human brain, as well as its behavioral associations. However, to date, a large sample with a long-term longitudinal design and a narrow age-span has been lacking for the assessment of test-retest reliability and reproducibility of brain-behavior correlations, as well as the development of novel causal insights into these correlational findings. Here we describe the SLIM dataset, which includes brain and behavioral data across a long-term retest-duration within three and a half years, mMRI scans provided a set of structural, diffusion and resting-state functional MRI images, along with rich samples of behavioral assessments addressed-demographic, cognitive and emotional information. Together with the Consortium for Reliability and Reproducibility (CoRR), the SLIM is expected to accelerate the reproducible sciences of the human brain by providing an open resource for brain-behavior discovery sciences with big-data approaches.</p

Broadband and omnidirectional anti-reflection coating for iii/v multi-junction solar cells

Contains fulltext : 123072.pdf (preprint version ) (Open Access

Ideal Ericsson cycle magnetocaloric effect in (La0.9Gd0.1)0.67Sr0.33MnO3 single crystalline nanoparticles

Single crystalline (La0.9Gd0.1)0.67Sr0.33MnO3 nanoparticles with the perovskite structure have been synthesized by the microwave-assisted hydrothermal process, following calcining of the nanoflower precursor at 900 °C for 2 h. Microstructure analysis was conducted by X-ray diffraction, and scanning and transmission electron microscopy (SEM, and TEM), as well as by field emission SEM, and high resolution TEM which confirmed the perovskite structure in the nanoparticles. Systematic magnetic measurements have been conducted on the nanoparticles. It was found that the Curie temperature can be tuned and decreased with Gd doping. It was also interesting to find that the magnetic entropy change (−ΔSM) in the (La0.9Gd0.1)0.67Sr0.33MnO3 nanoparticles extends over a very broad temperature range as a result of the Gd doping. The −ΔSM has the important feature of remaining almost constant in the temperature range above 60 K, suggesting that this type of nano-material is an ideal Ericsson cycle magnetic refrigerant for applications at room temperature