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The important applications of quantum dot system are to implement logic operations and achieve universal quantum computing based on different quantum nonlocalities. Here, we characterize the quantum steering, Bell nonlocality, and nonlocal advantage of quantum coherence (NAQC) of quantum dot system suffering nonunital and unital channels. The results reveal that quantum steering, Bell nonlocality, and NAQC can display the traits of dissipation, enhancement, and freezing. One can achieve the detections of quantum steering, Bell nonlocality, and NAQC of quantum dot system in different situations. Among these quantum nonlocalities, NAQC is the most fragile, and it is most easily influenced by different system parameters. Furthermore, considering quantum dot system coupling with amplitude damping channel and phase damping channel, these quantum nonlocalities degenerate with the enlargement of the channel parameters $t$ and $\varGamma$. Remarkably, measurement reversal can effectively control and enhance quantum steering, Bell nonlocality, and NAQC of quantum dot system suffering from decoherence, especially in the scenarios of the amplitude damping channel and strong operation strength. 相似文献
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铁基高温超导体自2008年发现以来,对其超导电性的研究一直是一个热门的课题.扫描隧道显微镜能够在原子尺度进行表面形貌和隧道谱测量,从微观角度研究电子态密度的信息,是研究超导的重要谱学手段.近年来,在铁基超导电性方面,扫描隧道显微镜实验已经积累了一些有价值的结果,本文进行了总结介绍.铁基超导体是多带多超导能隙的超导体,不同材料的费米面结构有很大的变化.扫描隧道显微镜证明,同时有电子和空穴费米面最佳掺杂的铁基样品超导能隙结构是无节点并带有能隙符号变化的s±波.而进一步的实验发现在没有空穴费米面的FeSe基超导体中也存在能隙符号的相反,对统一铁基超导体的配对对称性提供了重要实验证据.此外,扫描隧道显微镜在研究铁基超导体的电子向列相、浅能带特性、可能的拓扑特性方面,提供了重要的实验数据.本文对上述相关内容进行了总结,并做了相应分析和讨论. 相似文献
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高效液相色谱-高分辨质谱法鉴定水稻稻曲病菌毒素 总被引:1,自引:0,他引:1
建立了高效液相色谱-线性离子阱高分辨质谱(HPLC-LTQ/Orbitrap MS)鉴定稻曲球中5种稻曲病菌毒素的方法。样品匀浆后以水为提取剂超声提取10 min,混合阳离子交换柱PCX净化,采用Xselect HSS T3色谱柱(150 mm×2.1 mm, 3.5 μm)分离,以水(含0.1%(v/v)甲酸)和甲醇为流动相,梯度洗脱。在m/z 200~1000范围内进行一级质谱全扫描,结合准分子离子峰的精确质量数和同位素相对丰度进行质谱分析。结果表明,鉴定到5种稻曲病菌毒素,质量准确度小于1×10-6(1 ppm),同位素相对丰度偏差绝对值≤3.3%,二级质谱碎片离子与理论裂解一致,回收率为90%~105%。该方法简便,灵敏度高,定性准确,为稻曲病菌产毒能力等相关研究提供了技术手段。 相似文献