Second, the application range is different, and the application range of picoseconds is wider. The main selling point of picosecond technology is that the pulse width is shorter, that is, the time to act on the skin is shorter. The shorter the time, the better the curative effect and the smaller the side effects.
At this point, the pulse width of picoseconds is shorter than that of cellular picoseconds, which is about half of that of cellular picoseconds. Honeycomb picosecond has only one wavelength, and picosecond has three wavelengths, which has a wider treatment range and is more effective for skin problems.
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High-precision time transfer is the core technology of navigation, positioning and other applications in daily life. However, the widely used time transfer technology faces the potential risks of data tampering, signal deception and other attacks. Pan Jianwei team first proposed a quantum secure time synchronization scheme based on two-way free-space quantum key distribution technology.
Based on the "Mozi" quantum science experimental satellite, Pan Jianwei team broke through the key technologies such as satellite-to-ground single-photon time transfer, and achieved satellite-to-ground time transfer with an accuracy of 30 picoseconds (1 picosecond equals one trillionth of a second), reaching the international advanced level of satellite-to-ground laser time transfer.
Baidu encyclopedia-picosecond
People's Network-Chinese scientists realize quantum security time transfer