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物理学院“博约学术沙龙”系列报告 (总第 118期)

发布日期:2016年04月21日

时  间:   2016年4月21日(星期四)下午3:10
地  点:   中心教学楼610

报告一:博士生报告    时间:15:10-15:40
题  目:氧化锌基阻变开关及其特性研究
报告人:刘浩男                  指导老师: 王志
摘要:
近年来,由于存储器的快速发展,鉴于传统非挥发性Flash存储器在集成电路工艺32nm以下时技术节点的发展瓶颈,新型非挥发阻变存储器RRAM以其特征尺寸小、存储单元结构简单、读写速度更快、集成度更高、更低功耗,与现有半导体CMOS工艺相兼容的特点,引起了广泛关注和研究。ZnO以其良好的电学特性成为了阻变存储器的研究对象。本课题组主要研究结构为金属-绝缘体-金属(MIM)的氧化锌基阻变存储单元的构建及其开关特性。

报告二:博士生报告    时间:15:40-16:10
题  目:Quantum process discrimination with information from environment
报告人:王元美                   指导老师: 李军刚
摘要:
In the quantum metrology we usually extract information from the reduced probe system while ignore the information lost inevitably into the environment. However  K. MØlmer [Phys. Rev. Lett. 114, 040401 (2015)] showed that the information lost into the environment has an important effect on improving the successful probability of quantum process discrimination. Here, we reconsider the model of a driven atom coupled to an environment and distinguish which of two candidate Hamiltonians governs the dynamics of the whole system. We mainly discuss two measure methods one of which only obtains information from the reduced atom state and the other obtains information from both the atom and its environment. Interestingly, we show that the two methods need different initial states of the atom to improve the discrimination probability. By comparing these two methods we find that the partial information from the environment is very useful.

报告三:博士生报告    时间:16:10-16:40
题  目: Realization of Hardy’s thought experiment with classical light
报告人:张雄                   指导老师: 张向东
摘要:
We report the first realization of Hardy’s thought experiment in classical optical system. Two different classical optical experiments are implemented. One is based on orbital angular momentum (OAM) and polarization correlation in a classical optical beam, and the other one is based on non-local classical correlation from two separated classical optical beams. All experimental results show that they violate the local hidden-variable theory, which are analog to Hardy’s paradox experiments. It means that Hardy’s nonlocality proof without inequalities, which is usually used in quantum system to test the contradiction between quantum mechanism and local realism, can also be achieved in the classical optical system.

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