A research team at Basel University successfully developed a “ultra-low temperature electronic chip” whose temperature can be cooled to 2.8 milliliters, which is approximately 273.15 degrees Celsius below zero.
The development of the electronic chip is based on the principle of magnetic cooling, when the applied magnetic field is gradually reduced, the system will gradually cool down and avoiding any external heat flow. Professor Zumbühl and his colleagues at the University of Basel combined two cooling systems based on magnetic cooling. They cooled all the conductive connections of the chip to 150 micro Kelvin (less than one thousandth of a degree from absolute zero). They then applied the second cooling system directly to the chip itself and placed a Coulomb blockage thermometer. The structure and material of the thermometer allow it to be cooled to 2.8 milliKelvin by magnetic cooling.
Scientists said that the current level of technology has enabled the chip to maintain ultra-low temperatures for 7 hours. There will be plenty of time for exploration experiments, which will help to understand the physics of near absolute zero.