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Ji Sai 《Frontiers of Physics》2015,10(2):100303
Recently, Li et al. presented a two-party quantum private comparison scheme using Greenberger–Horne–Zeilinger (GHZ) states and error-correcting code (ECC) [Int. J. Theor. Phys. 52, 2818 (2013)], claiming it is fault-tolerant and could be performed in a non-ideal scenario. However, there exists a fatal loophole in their private comparison scheme under a special attack, namely the twice-Hadamard-CNOT attack. Specifically, a malicious party may intercept the other party’s particles and execute Hadamard operations on the intercepted particles as well as on his or her own particles. Then, the malicious party could sequentially perform a controlled-NOT (CNOT) operation between intercepted particles and the auxiliary particles, as well as between his or her own particles and the auxiliary particles prepared in advance. By measuring the auxiliary particles, the secret input will be revealed to the malicious party without being detected. For resisting this special attack, a feasible improved scheme is proposed by introducing a permutation operator before the third party (TP) sends the particle sequences to each participant. 相似文献
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为了拓展荧光辐射差分(Fluorescence Emission Difference,FED)显微术的应用,使得该方法可以同时对生物样品的不同组织结构进行超分辨成像,本文对双色FED显微系统展开了研究。FED的基本原理是将实心光斑扫描得到的共焦显微图像减去空心光斑扫描得到的负共焦图像,以此获得超分辨显微图像。在对单色FED显微系统进行研究后,本文提出了一种可行的双色FED显微成像系统方案。实验结果表明,在488 nm和640 nm激发光下,该系统在荧光颗粒上分别实现了135 nm和160 nm的空间分辨率,另外也能对生物样品的不同组织进行多色同时超分辨显微成像,满足了实际应用的要求。 相似文献
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Two protocols of quantum direct communication with authentication [Phys. Rev. A 73 (2006) 042305] were recently indicated to be insecure against the authenticator Trent attacks [Phys. Rev. A 75 (2007) 026301]. We present two efficient protocols by using four Panli operations, which are secure against inner Trent attacks as well as outer Eve attacks. Finally, we generalize them to multiparty quantum direction communication. 相似文献
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报道了对扫描探针电子能谱仪(SPEES)中俄歇电子出射的理论模拟研究。 通过对俄歇电子在针尖电场作用下运动轨迹的模拟以及综合考虑从针尖场发射电子到俄歇电子出射全过程中各种因素的影响, 系统研究了针尖形状、 针尖偏压和针尖 样品距离对俄歇电子出射效率的影响, 以及出射俄歇电子束流密度在针尖电场区边缘处的分布。 研究结果为提高SPEES的收集效率、 空间分辨以及能量分辨提供了重要的参考数据。 The simulation of the Auger electron emissions in scanning probe electron energy spectrometer (SPEES) is reported. By simulating the trajectory of Auger electrons, we systematically investigate the dependence of the emission efficiency of Auger electrons on the shape of tip, the biasing voltage, and the distance between the tip and sample surface, as well as the intensity distributions of Auger electrons at the edge of tip sample region. The results will be the significant reference for improving the sensitivity, spatial and energy resolutions of SPEEs. 相似文献
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采用多喷嘴电喷雾阵列作为离子迁移谱仪(IMS)的离子源以提高大气压下离子迁移谱的分析性能.12喷嘴的电喷雾阵列离子源内径为46μm,采用环形排列以提高喷雾电场的均匀度,喷嘴之间的距离为0.5 cm以克服喷嘴之间的电场屏蔽效应.测定了不同比例的甲醇作为ESI溶剂在2~ 30 μL/min流速及2.5~7 kV的喷雾电压下西地那非和苏丹红Ⅱ号的响应值及相应的信噪比.实验结果表明,在优化的条件下,多喷嘴电喷雾阵列可有效的提高ESI对溶液中水含量的容忍度,降低离子化噪音.与此同时,多喷嘴电喷雾阵列可使用更高的ESI流速.在相同的条件下,12喷嘴的电喷雾阵列离子源可提高离子化效率平均达3.8倍. 相似文献
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对一种中型直膨式太阳能PVT(光伏/光热)热泵热电联产系统进行了实验研究。通过对PV(光伏)组件与直膨式集热/蒸发器的合理耦合构建PVT热泵系统,直膨式背板可吸收太阳能电池废热,降低太阳能电池温度,有效提高光伏组件发电效率,同时提高了热泵循环蒸发温度和蒸发压力,改善了热泵系统的运行性能。背板采用新型直膨式集热/蒸发器流道结构,结合PVT组件阵列管路设计,有效提升了冷媒分布均一性和PVT组件工作温度的均匀性。实验结果表明系统在热水模式下的平均COP(Coefficient of Performance)可达6.45,供暖模式的平均COP达4.24。系统所发电量可用于自身压缩机、水泵运行或并入电网,且提供55?C以上的热水,从而实现太阳能PVT热泵系统高效热电联产。 相似文献
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The Legendre Collocation Spectral Method for the Ground State Solutions of the Bose-Einstein Condensates北大核心CSCD
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近年来,有关Bose-Einstein凝聚态基态解的实验研究已经取得了一系列重要的成果.该文在相关研究成果的基础上,首先通过降维和无量纲化方法将Bose-Einstein凝聚态基态解问题转换成能量泛函极值问题,在离散该泛函时,尝试使用Legendre配置谱方法离散该能量泛函的一维和二维情形.其次,对该能量泛函极小值问题进行了数值模拟.最后,通过分析实验数据结果和图像得出,针对非旋转的Bose-Einstein凝聚态的基态解问题可以使用Legendre配置谱方法来求解,且数值结果的误差较小. 相似文献