Quantum computers must operate at temperatures colder than deep space to keep qubits stable. While outer space sits at about 2.7 Kelvin, IBM’s latest modular cryogenic system reaches below 15 millikelvin, a temperature more than 180 times colder than the cosmic background.
This extreme chill protects the delicate qubits, which behave like dials rather than simple on/off switches and can become linked across the processor. Any external heat causes vibrations that disrupt qubit interactions, leading to decoherence and errors.
The heart of the cooling system is a dilution refrigerator, a stack of metal plates where the processor sits at the coldest point; however, the control wires run from room temperature and conduct heat downward, creating a paradox where more qubits require more wires and raise the temperature. Not all quantum computers rely on such giant fridges. Companies like QuEra use neutral‑atom platforms that trap atoms in a vacuum chamber and cool them with lasers to microkelvin levels, avoiding the wiring problem.
Photonic approaches also aim to reduce thermal load. By minimizing heat, quantum computers can maintain coherence longer, improving algorithmic accuracy and bringing practical quantum advantage closer. These cooling breakthroughs are essential for scaling quantum processors to millions of qubits, a milestone that could transform computing.
Source: Engadget · Summarized by HeadlinesBriefing