Speaker： Dr. Qi Zhao

    Dr. Qi Zhao received his B.S. degree from the Department of Mathematics, Tsinghua University, Beijing, China, in 2014. He received his Ph.D. degree in Physics from Institute for Interdisciplinary Information Sciences, Tsinghua University in 2018. From 2019, Qi conducted research as a postdoctoral fellow at University of Science and Technology of China (USTC). His research interests are in quantum resource theory, entanglement detection, self-testing quantum information and quantum computing. 

 

 

 

Title: Entanglement Structure Detection

Abstract:  Creating large-scale entanglement lies at the heart of many quantum information processing protocols and the investigation of fundamental physics. For multipartite quantum systems, it is crucial to identify not only the presence of entanglement but also its detailed structure. This is because in a generic experimental situation with sufficiently many subsystems involved, the production of so-called genuine multipartite entanglement remains a formidable challenge. Even if the system is not genuinely multipartite entangled, there may still be many-body entanglement present in the system. An identification of the entanglement structure may thus provide us with a hint about where imperfections in the setup may occur, as well as where we can identify groups of subsystems that can still exhibit strong quantum-information- processing capabilities. However, there is no known efficient methods to identify the underlying entanglement structure. Here, we propose two complementary families of witnesses for the identification of such structures. They are based, respectively, on the detection of entanglement intactness and entanglement depth, each applicable to an arbitrary number of subsystems and whose evaluation requires only the implementation of solely two local measurements. Moreover, we also show the entanglement structure detection in a measurement-device-independent manner. 

 

References:

Phys. Rev. X 8, 021072 (2018); Phys. Rev. A 94, 012343 (2016).

 

物理学院322，3月1日（周五）10：00AM

10:00AM 2019-03-01

Room 322, Bld. School of Physics