Date: August 21 (Friday)
Time: 14:00-15:00
Venue: Meeting Room 526
Speaker: Dr Wei ZHANG (Division of Quantum Comput & Comm)

Abstract:
Quantum engineering applications with large geographical scales, i.e., secure communications supported by quantum key distributions (QKDs), have put forward a clear demand for quantum photonic technologies at telecom band, which can be realized through long-distance optical fibers. In recent years, we focused on the research of telecom band correlated / entangled photon pair generation based on spontaneous four wave mixing (SFWM) in optical fiber and silicon photonic devices, developed four-wave mixing quantum light sources along the routes of all-fiber integration and on-chip integration, respectively, and applied them in several important applications of quantum communications. This talk will introduce the physical mechanism, implementation method and characteristics of four-wave mixing quantum light sources, then report our recent works about how to use them.

About the speaker:
Dr. Wei ZHANG received his bachelor's degree in 1998, and received his Ph.D. degree in 2003 in the electronic engineering department of Tsinghua University. In the same year, he stayed in Tsinghua as a lecturer. In December 2006, he was promoted to an associate professor. He obtained the qualification of doctoral supervisor in 2011, and served as the vice director of Institute of information optoelectronics, electronic engineering department, Tsinghua University. In August 2014, he was appointed as tenured associate professor. His research interest is quantum photonic devices and their applications on quantum communications and quantum information processing. In recent years, he focused on the research of quantum light sources based on spontaneous four wave mixing (SFWM). He proposed and demonstrated a variety of quantum light sources to generate different biphoton states based on fiber optics and silicon photonics, realizing a complete solution of telecom band quantum light sources and developing commercial quantum light source equipment. Recently, he applied these four-wave-mixing quantum light sources in several important applications of quantum communication. During his work in Tsinghua University, he has published more than 80 journal papers as the first author and corresponding author, authorized 10 invention patents. He is currently a senior member of the Optical Society of America and a member of the Chinese Optical Society.