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With the “Multi-photon Entanglement Interferometry†won the first prize of the 2015 National Science and Technology Award for Natural Science, “Si-substrate high-efficiency GaN-based blue light-emitting diode†won the first prize of technical invention, and the development of related industries is expected to further Speed ​​up.
In the silicon-based field, among the 100 billion LED industries planned and built by Jiangxi Province , silicon-based LEDs occupy half of the country, and many listed companies are involved. In the field of quantum communication, quantum communication “Beijing-Shanghai trunk line†is expected to be completed and accepted in 2016. The company has penetrated the quantum communication industry chain such as quantum dot lasers and optical devices.
Two technical industries have far-reaching effects
On the 8th, the results of the 2015 National Science and Technology Awards were announced. As previously reported by the Shanghai Securities Journal, "multi-photon entanglement interferometry" won the first prize in the natural sciences, and the first prize of the technical invention was spent on "silicon substrate high-efficiency GaN-based blue light-emitting diodes".
Pan Jianwei, an academician of the Chinese University of Science and Technology, and his team led the research and application of quantum communication in China by developing multiphoton entanglement interferometry. Multi-photon entanglement must be achieved if complex multi-step quantum computing or multi-user real-time secret quantum communication is to be implemented. The Pan Jianwei team realized the five-photon entanglement manipulation in 2004, and for the first time reached the number of bits necessary for quantum error correction; followed by six-photon entanglement, five-photon ten-bit super-entanglement, and eight-photon entanglement. In the key distribution, Pan Jianwei team realized the basic unit of scalable quantum relay, which made quantum communication realize the possibility of inter-city communication application; its entangled distribution and quantum teleportation of 100-kilometer level laid the foundation of quantum communication. technical foundation.
"In the field of quantum communications, China has spent less than 10 years developing from a humble country to a world powerhouse, leading Europe and North America." As early as 2012, Nature magazine evaluated Pan Jianwei's research.
Pan Jianwei said that he hopes to solve the problem of relay-based quantum communication through 3-5 years of efforts, and initially carry out the quantum experiment of the satellite. After 10 years of efforts, build a high-speed and practical wide-area network.
It is worth noting that experts in the field of quantum science say that the real quantum system is extremely fragile, and it is very easy to degenerate into an ordinary classical system in a very short period of time, making the original design all invalid, and it is generally optimistic. Google's D-wave quantum computer "quantum acceleration" is not obvious, because the "decoherence process" from quantum to classic is too fast, and the problem of preventing degradation may not be solved within ten years; now it can effectively enter the application field and bring benefits It is quantum precision measurement.
The major innovation significance of “silicon substrate high-efficiency GaN-based blue light-emitting diode†(hereinafter referred to as “silicon substrate technologyâ€) is that this technology is expected to enable China to build LED technology routes and industry standards with completely independent intellectual property rights . It is expected to have a profound impact on the pattern of China's LED industry.
The research team led by Professor Jiang Fengyi of Nanchang University has creatively developed a new LED lighting technology route and took the lead in realizing the industrialization of silicon substrate LED in the world. This achievement has achieved direct economic benefits of more than 1.1 billion yuan in the past three years. It has been successfully applied in the fields of street lamps , flashlights, miner's lamps, downlights , spotlights, color screens, home appliances and digital. Users are distributed all over the world. This project, which won the first prize of the 2015 National Technology Invention Award, broke through the foreign patents, and the new technology products invented formed a strong competitiveness in the market, which effectively enhanced the international status of China's LED technology.
On the three technical routes of LED substrates, Americans hold silicon carbide substrates, and the Japanese monopolize sapphire substrates. Based on the good thermal conductivity and stability of silicon substrates, low cost of raw materials, and the ability to realize large-size wafers and vertical structure devices, silicon-based substrate technology is expected by the industry. "If the silicon-based substrate technology is mature, with the mature 6-inch and 8-inch integrated circuit production lines, the price of led products is expected to be reduced by half." Industry insiders said.
The great technical difficulties faced by silicon substrates are lattice adaptation and thermal adaptation. Sun Qian, a key participant in the above project, based on previous research, innovated and utilized multi-layer AlGaN (GaN Heterojunction Field Effect Transistor) buffer layer technology, using the compressive stress established during high-temperature epitaxial growth to offset the cooling process. The tensile stress caused by the difference in thermal expansion coefficient avoids the occurrence of cracks in the gallium nitride film, and achieves high-quality crack-free gallium nitride.
In addition to the field of LED lighting , the industry insiders are optimistic about the wide application of silicon-based GaN in the field of integrated circuits. A research and development staff of a listed LED company said that although the company has not yet studied the field of silicon-based light-emitting, it is very optimistic about the combination of silicon-based gallium nitride and IC process, which may enable the computer CPU to realize photon transmission. A person in the field who is committed to the field said that silicon-based gallium nitride has a wide range of application requirements in the fields of silicon photonics, sensors, power devices, and RF.
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