Quantum Internet, a cutting-edge technology, is regarded as one of the most revolutionary technological advances in this century. It relies on a high-tech means called quantum teleportation. Compared with the well-known traditional Internet, it has made a qualitative leap in security, accuracy and efficiency. When it comes to quantum Internet, we have to mention the quantum light source chip, which is like the light of the quantum world, providing a new way for users to communicate quantum information.

In this field, our researchers have achieved remarkable achievements. They used electron beam exposure technology and dry etching process to overcome difficulties such as gallium nitride crystal thin film growth and waveguide sidewall scattering loss, and for the first time applied gallium nitride in quantum light source chips, which is still the first time internationally.

Most of the quantum light source chips used nowadays are made of silicon nitride materials. However, in contrast, gallium nitride chips have achieved significant breakthroughs in key performance, with the output wavelength range increasing from 25.6 nanometers to 100 nanometers, laying the foundation for future single-chip integration technology.

Zhou Qiang, a professor at the University of Electronic Science and Technology of China and director of the Quantum Internet Research Center at Tianfu Jiangxi Laboratory, told us: "It's like our 'quantum bulb' can illuminate more 'rooms'." He explained that this way, it can provide more abundant wavelength resources for the quantum Internet and allow more users to access the network using different wavelengths.

Not long ago, their team also broke a world record by increasing the number of solid-state quantum storage modes in the fiber optic communication band to 1650. These series of research achievements provide key device support for us to build a quantum Internet with large capacity, long distance and high fidelity.

This study has received strong funding from the National Science and Technology Innovation 2030 Major Project, the National Natural Science Foundation of China, and the SIChuan Provincial Science and Technology Plan. Recently, a research report on this achievement was published in the internationally renowned academic journal "Physics Review Letters" and was promoted as a "physics highlight".

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