题目：Toward quantum entanglement in solid state by Cooper pair splitting

报告人：谭振兵 博士后

                  Low Temperature Laboratory, Aalto University

时间：2017年11月22日上午9:30

地点：国家脉冲强磁场科学中心C204

报告摘要：

Quantum entanglement is at the heart of Einstein–Podolsky–Rosen (EPR) paradox, which is fundamental for quantum information. Quantum entanglement has been successfully realized in optics, where the experiment benefit from the easy generation of entangled photons. In solid state, however, the progress has been modest. One natural source for quantum entanglement in solid state is split Cooper pairs. A Cooper pair, split out from a superconductor into two different terminals, will form a non-local entangled spin pair. We report an experiment on a superconductor-graphene double quantum dot (QD) system, in which we observe Cooper pair splitting (CPS) up to a CPS efficiency of ~ 10%. Comparing to the previous Cooper pair splitters, we were able to independently tune the bias and the energy levels of the two graphene QDs. Benefit from that, for the first time, the energy levels of the two QDs were tuned to be asymmetric or symmetric with respect to Fermi level in the superconductor. And we observed CPS or elastic co-tunneling favored as predicted by current theories. The realization of CPS in graphene opens a door for graphene to be used for quantum information processing.

报告人简介：

Zhenbing Tan

Education:

Sept. 2005-July 2011, Ph.D, Daniel Chee Tsui Laboratory, Institute of Physics, Chinese Academy of Sciences.

Major: Electrical transport properties in low dimension electronic system Thesis: Quantum transport in graphene devices at low temperature.

Advisor: Prof. Changli Yang and Prof. Li Lu.

Sept. 2001-July 2005, B.S, School of Physics and Technology, Wuhan University, China.

Employment:

Feb. 2012-present, Postdoctoral Fellow Low Temperature Laboratory, Aalto University.

Aug. 2011-Feb. 2012, Research Assistance Daniel Chee Tsui Laboratory, Institute of Physics, Chinese Academy of Sciences.

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