Another milestone in quantum communication, the speed of light is stopped for 60 seconds

According to foreign media reports, in the framework of Einstein's theory of relativity, the speed of light is considered to be unable to "surpass". The "limit speed" in this universe has always been the goal of scientists' breakthroughs. Slow down the speed of light? Researchers from the University of Darmstadt in Germany successfully "trapped" light in the crystal for up to 60 seconds. This technology is a key step in the realization and improvement of quantum communication technology.

Another milestone in quantum communication, the speed of light is stopped for 60 seconds

Scientists at Harvard University had previously successfully "speed-limited" light and restored the speed of light again, but Harvard's experiment only limited the speed of light to one thousandth of a second, and the speed of light was only 48 kilometers per hour (38 Miles per hour)

The fastest speed of light in the cosmic vacuum environment cannot escape human control. The special crystal medium reduces the speed of light and completely stops it, according to Thomas Klaus, a scientist from the University of St Andrews in the United Kingdom. It has been very, very long for the experiment to control the speed of light, which is an important milestone!

As early as 1999, Harvard physicist Lene Vestergaard used a superfluid gaseous atomic cloud close to absolute zero to successfully reduce the speed of a controlled beam to 17 meters per second. After two years, the speed of light was stopped at a time. Within the interval. The speed of light is the "limit speed" in the current vacuum environment of the universe. Einstein's theory of relativity does not allow objects to move faster than the speed of light. The speed of light is 186,282 miles per second, which can be reached in 1.2862 seconds.

In order to "stop" the fastest light in the universe, German scientists used a technique called electromagnetic induction transparent effect (EIT), which makes the photoatomic resonance absorption frequency transparent by the quantum coherence effect. In the frequency spectrum, there are only transparent and non-absorbed channels in a certain frequency range, so German scientists need to control the bandwidth of the light pulse during the design experiment. In fact, the electromagnetically induced transparency effect is the result of quantum interference in a three-level system. The spectral theoretical calculation is usually based on the optical Bragg equation based on the atomic density matrix.

In this experiment, the scientist directed the controlled speed of light to the yttrium silicate crystal containing praseodymium element, and controlled the transparent state and opaque state of the crystal by controlling the laser beam, so that the incident beam could not be refracted, and finally controlled the photon with the intervention of atomic spin Carrying information. Previous experiments have also involved injecting controlled light velocity into a low-temperature rubidium (87Rb) atomic medium to achieve the purpose of reducing the speed of light. Polarized gradient cooling and a compressed magneto-optical trap are used to increase the density of controlled atomic groups. In addition, the Harvard-Smithsonian Center for Astrophysics also conducted research on the subject. The Bose-Einstein condensate atomic cluster was also used to freeze the information carried by the photons, the speed began to decrease, and the final storage time reached 1 millisecond. Quantum communication has great significance.

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