Minute delay of light in the crystal closer the time of the quantum memory




Scientists from the University of Darmstadt (Germany) were able to stop the light for one minute. Light, whose speed reaches nearly 300 million meters per second, was completely “frozen” inside the crystal. This phenomenon is called light memory – the process of saving images in a portable light crystals. The study brings scientists to create a quantum memory, and at the same time helps to go beyond the speed of light, writes resource Extremetech.

In 1999, scientists at slow speed of light up to 17 meters per second. Two years later, the same group of researchers has completely stopped the light, but only a few fractions of a second. Earlier this year, the Georgia Institute of Technology “froze” the light for 16 seconds. The last record – one minute.

German scientists have slowed light by electromagnetically induced transparency (EIT). The experiment began firing laser cryogenically cooled opaque crystal of yttrium silicate, activated by praseodymium. As a result of a complex reaction at the quantum level has become crystal clear. Then, the crystal was sent to the second light source with subsequent trip of the first (control laser), which took from the crystal property of transmitting light. The light is trapped, because it no longer could be reflected. Light in the truest sense stopped.


The photon energy is transferred to the atoms within the crystal, was the transformation of information into spin photon excitation of atoms. After the control spin excitation laser photons released. The atomic spins (angular momentum) are able to maintain the integrity of the data for almost a minute, after which a pulse of light (image) collapsed. In fact, the technology makes it possible to store and retrieve data from a light quantum memory.

Extend the data, you can also use other crystals, such as yttrium silicate with the addition of Europe and in particular the magnetic field. The experiment is one of the first steps to creating a long-range quantum networks. Quantum Internet will appear as soon found a way of coherent light storage at room temperature.

High-level programming language for quantum computing, which will determine the future of computers, has been created .
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Tags: Germany , Quantum Physics , Light Memory , University of Darmstadt .


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