The research on gallium nitride quantum light source chips has indeed made significant progress, and the following is a detailed summary of the research:

1、 Research background and significance

Gallium nitride, as a third-generation semiconductor material, has excellent properties such as high nonlinear coefficient and wide transparent window, and is widely used in fields such as blue light emitting diodes (LEDs). With the rapid development of quantum information technology, the potential application of gallium nitride in the field of quantum light source chips is gradually emerging. Quantum light source chip is the core device of quantum Internet, which is of great significance for promoting the development of quantum information technology.

2、 Research progress and breakthroughs

International first successful development:

In April 2024, Professor Zhou Qiang's research group of the Institute of Basic and Frontier Research of the University of Electronic Science and Technology of China and Professor Sun Changzheng's research group of the Department of Electronic Engineering of Tsinghua University jointly developed the GaN quantum light source core for the first time in the world with institutions such as the Chinese Academy of Sciences Shanghai Institute of Microsystems and Information Technology. This breakthrough achievement marks that China's technology application in the field of quantum Internet has reached the world's leading level.

Breakthrough in key indicators:

Gallium nitride quantum light source chips have achieved significant breakthroughs in key indicators such as output wavelength range. Compared with the current quantum light source chips that mostly use silicon nitride and other materials, the output wavelength range of GaN quantum light source chips has increased from 25.6 nm to 100 nm, providing more wavelength resources for the construction of quantum Internet.

Single chip integration potential:

Gallium nitride quantum light source chips also have the potential to develop towards single-chip integration. This will further improve its integration and performance, and promote the further development of quantum Internet technology.

3、 Technical Challenges and Solutions

In the development process of gallium nitride quantum light source chips, the research team faces many technical challenges, including high-quality gallium nitride crystal film growth, waveguide sidewall and surface scattering losses, and other issues. To address these challenges, the research team has put in a lot of effort and adopted a series of innovative technological means:

Optimize material growth process:

The research team continuously optimizes the material growth process and improves the quality of gallium nitride crystals. By adding "buffer layers" and other methods, the defects of the film have been reduced and its crystal quality has been improved.

Precision structural design and process control:

The research team effectively reduced the scattering losses of waveguide sidewalls and surfaces through precise structural design and process control. This provides an important guarantee for achieving high performance of gallium nitride quantum light source chips.

4、 Application prospects and prospects

The breakthrough of GaN quantum light source chip technology has brought new possibilities for the development of quantum Internet. As the core device of quantum Internet, GaN quantum light source chip will promote the further development of quantum information technology and play an important role in quantum computing, quantum communication, quantum sensing and other fields. In addition, gallium nitride materials have been widely used in various optical components due to their excellent physical properties, making them easier to integrate with existing silicon-based processes. This compatibility allows gallium nitride quantum light sources to be integrated with other electronic and optoelectronic components on silicon chips, such as sensors, processors, etc., making them more suitable for building complex quantum circuits on a single chip. This helps to reduce production costs and accelerate the commercialization process of optical quantum technology.

In conclusion, the significant progress in the research of GaN quantum light source chip has injected new vitality into the development of quantum Internet. With the continuous advancement of technology and the expansion of application fields, gallium nitride quantum light source chips are expected to play an increasingly important role in the field of quantum information technology.