A recent study published in the journal Nature by the British magazine Nature says the U.S. research team made use of the principle of parity-time symmetry (PT symmetry) to create a wireless power transmission system with different distances within 1 meter Can achieve efficient power transmission. In the experiment, the LED light can be successfully charged away from the power supply. The development of wireless power transmission technology will lay the foundation for many applications in today's society, such as charging implanted medical devices and wireless charging of stationary electric vehicles. However, creating a system that is unaffected by changes in operating conditions is not easy, for example, it can not be done without the restriction of the distance between the power source and the wireless powered device, and at the same time, the power transmission efficiency should be kept stable There is a bigger challenge. This time, the wireless power transmission system created by Fan Shanhui, a professor of electrical engineering at Stanford University in the United States and his colleagues, can achieve efficient power transmission within a distance of 1 meter. The system is made using the parity-time symmetry principle. Parity-time symmetry is a concept in quantum mechanics that describes the basic theory of movement of microscopic objects. In general, the symmetry in physics refers to the inherent invariance of a system under a particular transformation. The parity-time symmetry Spatial reflections and time invariance. The team made use of this principle to make the system maintain power transmission efficiency within a distance of about 1 meter. The research team conducted a test experiment using LED lights. The results show that the LED lamp can be powered, and can be far from the power - until about 1 meter of the demarcation point, the brightness of the process has been maintained. In a related news and commentary article, Jefferies, a researcher at the French Science Research Center and the Ecole Polytechnique at the Paris Institute of Advanced Physics and Chemical Engineering, said the latest finding is expected to be used to charge mobile devices or vehicles whose transmission distance and direction are constantly changing . Now people are no stranger to wireless power transmission, mobile phones, electric toothbrush this household equipment seems to be casually can be achieved. But they are not always good at charging efficiency, power and device distance. The new achievements now make it possible to break the above bottlenecks. In fact, not only small household electrical appliances and electric vehicles, in many "wire and cable" dangerous places, such as mines and oil exploration, or "wire" difficult places, such as remote islands and hill base stations, so efficient and stable wireless power transmission system Are crucial.