At 1:40 on August 16, the world's first quantum science experimental satellite "Mozi" was successfully launched, which means that quantum security communication has entered a new era, which is also a sign that China's quantum communication technology leads the world.
The "Mozi No." was launched by the Long March II carrier rocket. As the world's first quantum satellite, its technological content and precision have reached an unprecedented height in this research field. Two hours before the launch of the satellite, our reporter telephoned the team of the chief scientist of the Quantum Science Experimental Satellite and the Pan Jianwei team of the Chinese Academy of Sciences of Dongyang. Pan Jianwei told reporters that after the successful launch of the "Mozi", it will not only realize the long-distance quantum communication between satellite and the ground in the world, but also demonstrate the wide-area quantum communication network, and will also pass the quantum entanglement experiment of ultra-long distance. Answer and verify some basic principles of quantum physics such as quantum non-locality.
From the idea of ​​proposing a quantum satellite to the rise of the "Mozi", Pan Jianwei has been preparing for more than a decade. In 2003, when most of his peers were still working on quantum communication in the lab, Pan Jianwei had already thought of long-distance quantum communication, which could be achieved with satellites. This is because the photon is too much loss in the fiber, but 80% of the light in the sky reaches the ground, and the photon is sent to the outer space and then relayed by the satellite, which can effectively realize the quantum communication thousands of kilometers away. At the end of 2004, the Pan Jianwei team verified in the ground experiment that the quantum state survived well after crossing the entire vertical atmosphere, confirming the possibility of quantum communication. Since 2007, Pan Jianwei has cooperated with other institutions of the Chinese Academy of Sciences to conduct more ground verification. In 2010, they demonstrated the feasibility of launching a satellite. In 2011, the Chinese Academy of Sciences officially established a special project for quantum science experimental satellites. Five years later, the satellite was developed.
According to reports, the first quantum science experimental satellite uses a platform load integrated design, weighing 640 kg, orbital height of 500 km. It is equipped with a quantum key communication machine, a quantum entanglement transmitter, a quantum entanglement source, a quantum test control and a processor, and can simultaneously establish a quantum optical link with two optical stations on the ground that are thousands of kilometers apart. "Mozi" satellite launch is the first step to realize long-distance quantum communication. It is expected to realize free-space quantum communication between satellite and ground that breaks through fiber limitation, and combines with the existing optical fiber quantum communication network on the ground to construct a Wide-area quantum communication system.
According to reports, the "Mozi" launch has attracted worldwide attention because it will be the first time humans have moved quantum labs into space. In addition to greatly promoting the development of wide-area quantum communication technology, it will also The spatial scale verifies the non-locality of quantum mechanics and deepens human understanding of quantum theory itself.
"In addition to the application of communication security in the fields of national defense, government affairs and finance, we hope that through the efforts of 5 to 10 years, we will form a wide-area quantum communication network infrastructure and a complete quantum communication industry chain in China, and apply it to us in the future." On the mobile phone and in the daily lives of ordinary people," said Pan Jianwei.
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