According to a report by the Science and Technology Daily on the 19th, the Information and Quantum Laboratory of the University of Electronic Science and Technology of China revealed that the research team of the laboratory recently collaborated with Tsinghua University in Beijing and the Shanghai Institute of Microsystem and Information Technology of the Chinese Academy of Sciences to develop gallium nitride quantum light source chips for the first time internationally. This is also another important progress achieved by the University of Electronic Science and Technology of China's "Ginkgo One" urban quantum internet research platform, and the relevant achievements were published in the "Physical Review Letters."
It is understood that quantum light source chips are the core devices of quantum internet and can be regarded as "quantum light bulbs" that illuminate "quantum rooms," enabling Internet users to have the ability to interact with quantum information.
The research team overcame 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 for the first time internationally applied gallium nitride material to quantum light source chips.
Currently, quantum light source chips are mostly developed using materials such as silicon nitride. In comparison, gallium nitride quantum light source chips have made breakthroughs in key indicators such as output wavelength range, increasing from 25.6 nanometers to 100 nanometers, and can develop towards single-chip integration.
"This means that 'quantum light bulbs' can illuminate more rooms," explained Zhou Qiang, professor at the Institute of Fundamental and Frontier Sciences of the University of Electronic Science and Technology, and director of the Tianfu Jiangxi Laboratory Quantum Internet Frontier Research Center. By providing more wavelength resources for the construction of quantum internet, it can meet the needs of more users to access quantum internet with different wavelengths.
Just over a month 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. The consecutive research advances will further provide key device foundations for the construction of high-capacity, long-distance, and high-fidelity quantum internet.
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