Experimental measurement of the quantum geometric tensor using coupled qubits in diamond     

Min Yu  Pengcheng Yang  Musang Gong  Qingyun Cao  Qiuyu Lu  Haibin Liu  Shaoliang Zhang  Martin B Plenio  Fedor Jelezko  Tomoki Ozawa  Nathan Goldman  Jianming Cai 《国家科学评论(英文版)》2020,7(2):254

Geometry and topology are fundamental concepts, which underlie a wide range of fascinating physical phenomena such as topological states of matter and topological defects. In quantum mechanics, the geometry of quantum states is fully captured by the quantum geometric tensor. Using a qubit formed by an NV center in diamond, we perform the first experimental measurement of the complete quantum geometric tensor. Our approach builds on a strong connection between coherent Rabi oscillations upon parametric modulations and the quantum geometry of the underlying states. We then apply our method to a system of two interacting qubits, by exploiting the coupling between the NV center spin and a neighboring ¹³C nuclear spin. Our results establish coherent dynamical responses as a versatile probe for quantum geometry, and they pave the way for the detection of novel topological phenomena in solid state.  相似文献   

Mindfulness‐based SEL programming to increase preservice teachers’ mindfulness and emotional competence          下载免费PDF全文

Pamela W. Garner  Stacy L. Bender  Megan Fedor 《Psychology in the schools》2018,55(4):377-390

Eighty‐seven preservice teachers, some of whom had preschool teaching experience, were randomly assigned to an intervention that included training in breathing awareness meditation infused with social‐emotional learning (n = 43) or a control group that received training in (n = 44) in breathing awareness meditation only. Both groups showed an increase in mindfulness from pre‐ to posttest. However, as expected, dimensions of emotional competence improved more significantly for preservice teachers in the intervention group. Increases were also greater for participants with teaching experience. Both groups also increased in the belief that classroom misbehavior would result in negative cognitive and social costs to children, but a larger increase was observed for the intervention group. Implications for teacher preparation are discussed.  相似文献   

The dangers of schooling: the introduction of school medical inspection in the Netherlands (c.1900)     

Nelleke Bakker  Fedor de Beer 《History of education》2013,42(4):505-524

In this article the authors address the question of why school medical inspection in the Netherlands developed not only considerably slower than the British service but did so also on a more modest scale in terms of the impact on children’s lives. In the Netherlands school doctors were not allowed to treat children’s illnesses and therefore never opened clinics of their own. Likewise, they did not become part of the school system or even join forces in a national school medical service. To explain this the authors discuss the history of school hygienic concern since the mid‐nineteenth century, the respective roles played and arguments provided by the medical and teaching professions in the process of claiming the necessity for school medical inspection, and the conditions that have determined the appointment and instructions of school doctors since 1904. They draw the conclusion that the rapidly growing power of religious groups has limited the expansion of the medical regime. In the Netherlands schoolchildren did not become part of the ‘social body’ because of national fitness, but because society no longer accepted the inadequacy of the protection of pupils’ health against the dangers of schooling, especially after compulsory education was introduced.  相似文献