Reporter: Prof. Ji hua Zhang

Time: 2024-08-02 15:00-16:00

Place: The Large Conference Room on the second floor, B4

Abstract

Photons have the advantages of long-distance transmission at a speed of light, long coherence time, and easy manipulation in various quantum systems. Optical quantum technology will play an important role in many fields such as quantum communication, quantum computing and quantum precision measurement. However, most traditional quantum optics are based on block glass or crystal materials, which is not conducive to system miniaturization and scalability. In recent years, the regulation of the metasurface of the light field based on subwavelength and thickness of micro-nano structure arrays has become an ideal platform to solve this important problem. This report will introduce ultra-thin quantum light sources based on nonlinear metasurfaces and photonic state characterization based on linear metasurfaces. Specifically, it will be shown that entangled photon pairs are generated based on the spontaneous parameter downconversion process in the lithium niobate metasurface, and the output photon state is generated and controlled using the optical resonance supported in the metasurface, and then quantum imaging is achieved based on this quantum light source. The second part will achieve ultra-stable multi-port quantum interference based on a single silicon metasurface grating and will be used to statically characterize the isotropy of two photons in all degrees of freedom.

Biography

Zhang Jihua, a researcher at the Songshan Lake Materials Laboratory, obtained a dual doctorate from the University of Thackeray in Paris and Huazhong University of Science and Technology in 2016. He has worked in postdoctoral research in the Department of Optics at the University of Rochester and the Department of Physics at the Australian National University in the United States. In recent years, it has been mainly engaged in quantum metasurface research, and has published a total of 52 SCI papers, including 25 papers for the first/or corresponding author, including 1 Science Advanceds, 1 Light: Science & Applications, 1 Optica, and 1 Nano Letters. It has been invited to write a review paper in related fields on Advanced Materials and APL Quantum. It has also published 27 papers in well-known academic journals such as Nature Photonics and Nature Nanotechnology. It has more than 20 oral reports from international academic conferences, including 6 special invitation reports.