On the 18th, the reporter learned from the Information and Quantum Laboratory of University of Electronic Science and Technology of China that the research team of the laboratory, in cooperation with Tsinghua University and the Chinese Academy of Sciences Shanghai Institute of Microsystems and Information Technology, has developed gallium nitride quantum light source chips for the first time in the world. This is another important progress made by the "Ginkgo No.1" metro quantum Internet research platform of University of Electronic Science and Technology of China, and the related results were recently published in the Physical Review Express. It is understood that the quantum light source chip is the core device of the quantum Internet, which can be seen as a "quantum light bulb" to light up the "quantum room", enabling Internet users to have the ability to interact with quantum information. The research team has overcome technical challenges such as high-quality gallium nitride crystal film growth, waveguide sidewall and surface scattering losses through iterative electron beam exposure and dry etching processes, and has applied gallium nitride materials to quantum light source chips for the first time internationally. At present, quantum light source chips are mostly developed using materials such as silicon nitride. Compared with gallium nitride quantum light source chips, the output wavelength range has increased from 25.6 nanometers to 100 nanometers and can be developed towards single-chip integration. "This means that the 'quantum bulb' can light up more rooms." Zhou Qiang, professor of the Institute of Basic and Frontier Studies of University of Electronic Science and Technology of China and director of the Quantum Internet Frontier Research Center of Tianfu Jiangxi Laboratory, explained that more wavelength resources can enable more users to access the quantum Internet using different wavelengths. Not long ago, the team increased the capacity of solid-state quantum storage in the fiber optic communication band to 1650 modes, breaking the world record in this field. A series of research progress will further provide key devices for the construction of high-capacity, long-distance, high fidelity quantum Internet. (Lai Xin She)
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