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Entanglement detection length of multipartite quantum states

Speaker: Qi Zhao University of Hong Kong
Time: 2024-04-29 14:00-2024-04-29 16:00
Venue: S327, MMW Building (#腾讯会议:830-897-375 会议密码:1984)


Multipartite entanglement is a crucial resource for quantum computing, communication, and metrology. However, detecting this resource can be challenging: for genuine multipartite entanglement it may require global measurements that are hard to implement experimentally. In this study, we introduce the concept of entanglement detection length, defined as the minimum observable length required to detect genuine multipartite entanglement. We characterize the entanglement detection length for various types of genuinely entangled states, including GHZ-like states, Dicke states, and graph states. We also present a classification of genuinely entangled states based on entanglement detection length. Furthermore, we demonstrate that the entanglement detection length differs from the minimum observable length needed to uniquely determine a genuinely entangled state. Our findings are valuable for minimizing the number of observables that must be measured in entanglement detection.

Short Bio:

Dr. Qi Zhao is a Tenure-Track Assistant Professor in the Department of Computer Science at the University of Hong Kong (HKU).  His research interests include quantum simulation, quantum computing, resource theory, self-testing quantum information, and entanglement detection.  He is interested in any fundamental problem in quantum information and the practical applications of quantum computers.  He received his PhD degree from Tsinghua University in Dec. 2018.  Then, he became a postdoctoral researcher at the University of Science and Technology, China, from Jan. 2019 to Oct. 2019.  In Dec. 2019, he joined the University Of Maryland QuICS as a Hartree Postdoctoral Fellow in quantum information science.