Scientists from the oldest University of Basel in Switzerland have set a new temperature record for super-strength cooling, but the most valuable development promise is to adapt the approach used to cool quantum processors and even normal semiconductors.
The solution proposed is a chain of copper islands on a silicon substrate. The same or similar chain works as a thermometer, measuring a record low temperature is as difficult to achieve as it is to achieve. The sample was cooled with two technologies: magnetic fields and liquid helium.
The main refinement of the refrigeration unit was a very "rigid" fixation of the sample, which removed the "helium-based heat" effects from the refrigeration system. In the process of operation, the helium-based refrigerator creates vibrations that are transmitted to the sample and prevent it from cooling as much as it could. Remember, cooling the substance to near zero temperatures means as much as possible to slow down the fluctuations in the atoms of the substance. In fact, quantum mechanics enter the game and quantum states are destroyed in any "chiche."
A well-established sample was first covered with a strong magnetic field, which smoothed the backs of copper atoms and allowed the material to cool effectively and then gradually cooled it with a solvent.
Combined cooling has produced a new record minimum temperature value of 220 μCs or just 220 million degrees above absolute zero. In the future, researchers want to use their method to reduce temperature by another 10 times and eventually adapt it to cool down semiconductive materials. This will open the way to new quantum effects and a variety of applications, such as the optimization of cubics in quantum computers.