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国家重点基础研究发展计划(2006CB921606)

作品数:4 被引量:7H指数:2
相关作者:李建青陈子鹏马争争徐萍范端更多>>
相关机构:华中科技大学武汉理工大学更多>>
发文基金:国家自然科学基金国家重点基础研究发展计划更多>>
相关领域:理学电子电信一般工业技术更多>>

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Structure formation of entanglement entropy in a system of two superconducting qubits coupled with an LC-resonator被引量:1
2011年
This paper investigates theoretically the evolutions of the entanglement entropy of a system of two coupled-charge- qubits interacting with an LC-resonator. It is found that when the initial states of the two qubits are prepared in a given superposition excited state, the evolution of the von Neumann entropy of the system depends significantly on the coupling strength between the two Josephson charge qubits. With the variation of the coupling strength, the evolution of the entanglement entropy of the system forms some structures, especially the periodically bistable properties, which are the first discovered for such a system to our knowledge. It is found that the relative entropy entanglement of the system is also sensitive to the variation of the coupling strength between the two charge qubits, some novel 'collective oscillations' of the relative entropy are found for the system.
葛国勤覃翠尹淼黄勇华
高温高压下Co掺杂ZnO的压敏特性被引量:2
2010年
利用CS-m-D六面顶压机,对钴掺杂氧化锌Zn1-xCoxO(x=0,0.02,0.05,0.1)纳米粉末样品,在温度为600℃和压力为常压、4 GPa、6 GPa的条件下进行高温高压处理。通过对样品的X射线衍射分析和伏安特性测量,结果表明,高温高压能够有效促进材料晶粒成长,并有效提高样品的压敏特性。同时,实验显示,不同组分的Zn1-xCoxO样品中,x=0.05的样品具有较好的压敏特性。另外,通过分析指出,高温高压下掺杂样品产生的晶界偏析也是提高样品非线性的原因之一。
马争争李建青陈子鹏徐萍
关键词:ZNO低压压敏电阻钴掺杂高温高压
Magnetism in Mn and Co doped ZnO bulk samples被引量:4
2007年
Bulk samples with nominal composition Zn0.95Co0.05O and Zn0.92Co0.05Mn0.03O were fabricated by a solid-state reaction method at 600℃.X-ray diffraction experiment showed that the peaks of secondary phase Co3O4 with a cubic structure were visible in both samples,besides the main peaks of wurtzite structure as ZnO.Magnetization measurement indicated that doping Co alone can induce ferromag- netism in ZnO itself,while the introduction of Mn significantly enhances ferromagnetism.However, both samples showed different magnetic behavior at temperatures below 50 K.It was also noted that ferromagnetic coupling interaction was weakened due to the presence of antiferromagnetic Co3O4.
WANG YongQiang YUAN SongLiu SONG YunXing LIU Li TIAN ZhaoMing LI Pai ZHOU YuanMing LI YunLong YIN ShiYan
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