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Remote preparation of a Greenberger--Horne--Zeilinger state via a two-particle entangled state 总被引:2,自引:0,他引:2 下载免费PDF全文
We present two schemes for realizing the remote preparation of a
Greenberger--Horne--Zeilinger (GHZ) state. The first scheme is to remotely
prepare a general N-particle GHZ state with two steps. One is to prepare a qubit
state by using finite classical bits from sender to receiver via a
two-particle entangled state, and the other is that the receiver introduces
N - 1 additional particles and performs N - 1 controlled-not (C-Not)
operations. The second scheme is to remotely prepare an N-atom
GHZ state via
a two-atom entangled state in cavity quantum electrodynamics (QED). The two
schemes require only a two-particle entangled state used as a quantum
channel, so we reduce the requirement for entanglement. 相似文献
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以电纺In_2O_3纳米纤维为模版,通过溶剂热法构建了p-CuO/n-In_2O_3异质结纳米纤维.采用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射(XRD)和X射线光电子能谱(XPS)等方法对所得材料的形貌和结构进行表征.结果表明,CuO纳米颗粒可以均匀地负载在超细In_2O_3纳米纤维表面;随着反应液中乙酸铜浓度的增加,负载的CuO纳米颗粒密度也逐渐增加.通过制备旁热式气敏器件对复合纳米纤维材料的气敏特性进行了研究.结果表明,与纯In_2O_3纳米纤维相比,p-CuO/n-In_2O_3异质结纳米纤维对H_2S气体具有较高的灵敏度和较低的工作温度. 相似文献
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The effects of fast neutron irradiation on oxygen atoms in
Czochralski silicon (CZ-Si) are investigated systemically by using
Fourier transform infrared (FTIR) spectrometer and positron
annihilation technique (PAT). Through isochronal annealing, it is
found that the trend of variation in interstitial oxygen
concentration ([Oi]) in fast neutrons irradiated CZ-Si
fluctuates largely with temperature increasing, especially between
500 and 700℃. After the CZ-Si is annealed at 600℃, the
V4 appearing as three-dimensional vacancy clusters causes the
formation of the molecule-like oxygen clusters, and more importantly
these dimers with small binding energies (0.1--1.0eV) can diffuse
into the Si lattices more easily than single oxygen atoms, thereby
leading to the strong oxygen agglomerations. When the CZ-Si is
annealed at temperature increasing up to 700℃, three-dimensional
vacancy clusters disappear and the oxygen agglomerations decompose
into single oxygen atoms (O) at interstitial sites. Results from
FTIR spectrometer and PAT provide an insight into the nature of the
[Oi] at temperatures between 500 and 700℃. It turns out
that the large fluctuation of [Oi] after short-time
annealing from 500 to 700℃ results from the transformation of
fast neutron irradiation defects. 相似文献
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针对第三代大输量天然气管道爆炸振动危害效应展开研究,组织实施了全尺寸天然气管道爆炸试验。经数据分析发现,天然气管道爆炸地振动的衰减更加符合指数分布而非传统幂率分布,且其振动强度在空间内分布不均匀,存在特定方向振动加强的现象。采用改进型的MP-WVD算法分析得到天然气管道爆炸地振动的时频特性,其振动的主要频率范围为10~20 Hz,持续时间为0.1~0.2 s。存在多次加载特性,瑞利波成分强于勒夫波成分。研究成果可为后续管道施工安全设计以及事故现场勘测提供参考。 相似文献
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本文运用第一性原理GGA+U方法计算了C元素单/双掺杂金红石型TiO_2的电子结构、磁性和光学性质.结果表明,C掺杂体系的晶格发生畸变和体积相应增大.单掺杂体系的磁矩为1.3μB,磁矩主要归因于杂质态引起的自旋电荷密度不平衡,杂质态主要由C-2p、O-2p和Ti-3d的态电子构成,且它们之间存在明显的杂化现象.双掺杂体系中C原子之间的反铁磁性耦合比铁磁性耦合更加稳定,但其磁矩为零.另外,随着掺杂浓度的增大,掺杂体系的带隙由2.58 eV增大到3.4 eV,且在可见光区域的光吸收效率明显增大.这表明带隙的减小可能不是光谱吸收增强的主要因素,而带隙中的杂质态极大地影响了光谱吸收效率. 相似文献
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ZnO纳米球的溶剂热合成及其结构和光学性质 总被引:3,自引:3,他引:0
针对目前采用溶剂热方法制备的ZnO纳米球尺寸比较大,而模板法制备技术又比较复杂的缺点,用六甲基次胺(HDA)作为辅助试剂,采用溶剂热法制备出了小尺寸的ZnO纳米球。本方法不采任何模板,制备过程简单易操作,重复性好。在场发射电子显微镜下可清楚地看到所制得纳米球尺寸分布比较均匀,每一个纳米球都是由许多粒径在20~30nm的小球共同组成的。X射线衍射结果表明所得产物均为六角纤锌矿结构的ZnO。用谢乐公式算得的粒子尺寸在5~11nm,而且随着制备时间的延长和制备温度的升高,ZnO激子吸收峰发生红移,显示出明显的量子限制效应,这表明那些小球可能是由尺寸更小的ZnO纳米粒子所组成。光致发光谱中紫外发射与可见发射的强度比随着制备时间的延长和制备温度的升高而大,表明ZnO纳米粒子的尺寸增大,结晶性变好。 相似文献