ALBERT

Description: Author(s): Yu-Xiang Zhang, Shengjun Wu, Zeng-Bing Chen, and Yutaka Shikano In the optomechanical cooling of a dispersively coupled oscillator, it is only possible to reach the oscillator ground state in the resolved sideband regime, where the cavity-mode linewidth is smaller than the resonant frequency of the mechanical oscillator being cooled. In this paper, we show that … [Phys. Rev. A 94, 023823] Published Thu Aug 11, 2016

Description: Author(s): Xuanmin Zhu, Yu-Xiang Zhang, and Shengjun Wu Direct state tomography (DST) using weak measurements has received wide attention. Based on the concept of coupling-deformed pointer observables presented by Zhang et al. [Y.-X. Zhang, S. Wu, and Z.-B. Chen, Phys. Rev. A 93 , 032128 (2016) ], a modified direct state tomography (MDST) is proposed, exam… [Phys. Rev. A 93, 062304] Published Thu Jun 02, 2016

Description: Author(s): Meng Wang, Yu Xiang, Qiongyi He, and Qihuang Gong The multipartite entangled state has drawn broad attention for both foundations of quantum mechanics and applications in quantum information processing. Here, we study the spatially separated N-partite continuous-variable Greenberger-Horne-Zeilinger–like states, which can be produced by a linear opt... [Phys. Rev. A 91, 012112] Published Tue Jan 20, 2015

Description: A unique configuration of PbZr 0.4 Ti 0.6 O 3 multilayer stack was designed and grown on F-doped tin oxide thin film by spin casting and annealing process. The multilayer system exhibits a broad reflection band with peak reflectivity over 95% and band width no 〈 40 nm, a dielectric constant of 520 and dielectric tunability of ~49% at 1 MHz, a remanent polarization of 46.8  μ C/cm 2 , and a polarization loss of 〈 5% after 10 9 polarization switching cycles, rendering excellent performance as 1D photonic crystals and as ferroelectric and dielectric media. This material structure may find application in photonic band-gap engineering, microwave tunable devices, and integrated optoelectronics.

Description: Structure, dielectric response, and magnetic properties of Y 3 Fe 5− x Al x O 12 ( x  =   0, 0.5, 1, 2, and 3) ceramics were investigated. X-ray diffraction (XRD) patterns indicate a single phase with garnet structure in space group Ia3d for all sintered samples. Rietveld refinement of XRD data suggest that Al 3+ substitutes for Fe 3+ at tetrahedral sites. All the samples show a giant dielectric response which originates from the charge carrier hopping between the Fe 2+ and Fe 3+ . The activation energy of the hopping process increases with increasing Al substitution. The a-d super-exchange interaction becomes weak as the content of Al increases, which results in the decrease of saturation magnetizations and magnetic ordering temperatures.

Description: Structure, dielectric response, and magnetic properties of Y 3 Fe 5− x Al x O 12 ( x  =   0, 0.5, 1, 2, and 3) ceramics were investigated. X-ray diffraction (XRD) patterns indicate a single phase with garnet structure in space group Ia3d for all sintered samples. Rietveld refinement of XRD data suggest that Al 3+ substitutes for Fe 3+ at tetrahedral sites. All the samples show a giant dielectric response which originates from the charge carrier hopping between the Fe 2+ and Fe 3+ . The activation energy of the hopping process increases with increasing Al substitution. The a-d super-exchange interaction becomes weak as the content of Al increases, which results in the decrease of saturation magnetizations and magnetic ordering temperatures.

Description: Abstract Prediction of the peak break‐up water level, which is the maximum instantaneous stage during ice break‐up, is desirable to allow effective ice flood mitigation, but traditional hydrologic flood routing techniques are not efficient in addressing the large uncertainties caused by numerous factors driving the peak break‐up water level. This research provides a probability prediction framework based on vine copulas. The predictor variables of the peak break‐up water level are first chosen, the pair copula structure is then constructed by using vine copulas, the conditional density distribution function is derived to perform a probability prediction, and the peak break‐up water level value can then be estimated from the conditional density distribution function given the conditional probability and fixed values of the predictor variables. This approach is exemplified using data from 1957 to 2005 for the Toudaoguai and Sanhuhekou stations, which are located in the Inner Mongolia Reach of the Yellow River, and the calibration and validation periods are divided at 1986. The mean curve of the peak break‐up water level estimated from the conditional distribution function can capture the tendency of the observed series at both the Toudaoguai and Sanhuhekou stations, and more than 90% of the observed values fall within the 90% prediction uncertainty bands, which are approximately twice the standard deviation of the observed series. The probability prediction results for the validation period are consistent with those for the calibration period when the nonstationarity of the marginal distributions for the Sanhuhekou station are considered. Compared with multiple linear regression results, the uncertainty bands from the conditional distribution function are much narrower; moreover, the conditional distribution function is more capable of addressing the nonstationarity of predictor variables, and the conclusions are confirmed by jackknife analysis. Scenario predictions for cases in which the peak break‐up water level is likely to be higher than the bankfull water level can also be conducted based on the conditional distribution function, with good performance for the two stations.

Description: Author(s): Yu-Xiang Zhang, Shengjun Wu, and Zeng-Bing Chen While the novel applications of weak values have recently attracted wide attention, weak measurement, the usual way to extract weak values, suffers from risky approximations and severe quantum noises. In this paper, we show that the weak-value information can be obtained exactly in strong measuremen… [Phys. Rev. A 93, 032128] Published Mon Mar 21, 2016

Description: Reaction of p -phenylenediacetonitrile ( p -phda) with AgCF 3 COO afforded the coordination polymer, {[Ag 2 ( p -phda) 2 ] [Ag 4 (CF 3 COO) 6 ]} n ( 1 ), where the 1D cationic [Ag 2 ( p -phda) 2 ] 2+ chain acts as host and the anionic [Ag 4 (CF 3 COO) 6 ] 2– as guest molecules occupy the channel between neighboring host chains. This is a rare crystal example of AgCF 3 COO complex consisting of cationic complex chains and anionic guests. In addition, complex 1 exhibits luminescence at room temperature in solid state.

Description: Author(s): Xiao-Xiao Zhang, Yu-Xiang Yang, and Xiang-Bin Wang We study the precise phase estimation using squeezed states in the presence of photon loss. Our exact quantum Fisher information calculation shows significant enhancement even though the loss is very large and sets a benchmark for experimental realization. We show that if we blindly use the existing... [Phys. Rev. A 88, 013838] Published Tue Jul 23, 2013