China has achieved an international free space high -precision time frequency transmission experiment for the first time in the world. The experimental results are expected to have an important impact on basic physics research such as dark substance detection, basic constant constant tests of physics, and relativity test inspection.
According to CCTV reports, Pan Jianwei team of China University of Science and Technology cooperates with the Shanghai Technical Institute, Xinjiang Observatory and other units to achieve an international high -precision time frequency transmission experiment of 100 kilometers of free space.On the evening of the 5th, it was published in the Natural Journal of International Academic Journal.
In terms of light sources, Chinese scientists have developed high -power and high -stability light comb. In terms of optical signal and receiving channels, high stability and high -efficiency light -receiving telescope systems are developed.Interference measurement methods realize high -precision time measurement.After a series of technical research, it finally achieved the time -frequency transmission of a negative 19th level of 10 seconds between the Nanshan Observatory of Xinjiang and Gao Yazi Observatory, which is 113 kilometers apart.
In the field of science, the measurement accuracy of time has entered the negative 19th level of 10, that is, tens of billions, the error is less than 1 second.As one of the seven basic physical quantities, it is currently the most accurate physical quantity.There are the most accurate timing, and there must be time transmission technology that matches the accuracy. The two are equally important.
The precise measurement and transmission of time will enable people to experiment with basic physics such as the principles of relativity, various gravity theories, dark matter models, etc.
At the same time, this is also closely related to human life. For example, the navigation accuracy of satellites is closely related to timing accuracy. If you want to be more accurate, such as accurate to below millimeters, you need better timing accuracy.In the fields of earth measurement, geological exploration, radar detection, etc. involving social livelihood, accurate time will also play an important role.
The definition of "seconds" is determined in 1967. After decades of development, the international measurement organization plans to discuss the change of "second" definition in 2026.
Zhang Qiang, a professor at the University of Science and Technology of China, said, "Then it also proves that it can be placed on the satellite in the future, which can be based on satellites.If the intercontinental comparison, then we can realize the definition of the new generation 'second'. "
