VTT scientists have efficiently demonstrated a new digital refrigeration technology that would allow major leaps in the improvement of quantum computers. Current quantum computers require extraordinarily complicated and huge cooling infrastructure that’s based on a mixture of isotopes of helium. The new digital cooling technology may exchange these cryogenic liquid mixtures and enable miniaturization of quantum computers.
On this purely electrical refrigeration technique, cooling and thermal isolation function successfully by way of the same level as a junction. In the experiment, the researchers suspended a bit of silicon from such junctions and refrigerated the object by feeding electrical current from one junction to a different through the piece.
The present lowered the thermodynamic temperature of the silicon object up to 40% from that of the surroundings. This might lead to the miniaturization of future quantum computers, as it could simplify the required cooling infrastructure considerably. The discovery has been revealed in Science Advances.
Several delicate electronic and optical devices require a low-temperature operation. One timely instance is a quantum computer constructed from superconductive circuits, which require refrigeration near the absolute zero of thermodynamic temperature.
Today, superconductive quantum computer systems are cooled by so-called dilution fridges, which are multi-stage coolers based on the pumping of cryogenic liquids.