IBM Pushes System Design To Reach Ultra-Cold Temperatures For Quantum

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IBM Pushes System Design To Reach Ultra-Cold Temperatures For Quantum

Jeff Burt

Jeff<br>Burt

Published<br>wed 19 Aug 2026 // 15:16 UTC

IBM, Google, Rigetti, and IQM Quantum Computers have adopted the superconducting modality for their quantum computing efforts, and therefore they need to ensure their systems operate at ultra-cold temperatures near absolute zero – in the range of 10 millikelvins to 20 millikelvins. This requirement brings with it a range of engineering challenges, including the cost, size, and scalability of these cooling units.<br>But deep cool has got to be done, just like cooling has to be thought through for the modern AI datacenter these days with compute racks pushing up to a megawatt of heat in the coming years.

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Qubits in any quantum modality are fragile and can break apart and lose data due to outside forces, from light to noise to the actions of other qubits. In superconducting computers, the delicate electron pairs that create the quantum state are vulnerable to the atomic vibrations caused by heat – thermal noise – and can be pulled apart, losing data before a calculation can be completed.<br>This week, IBM unveiled a modular and scalable cryogenic cooling subsystem (below) that the company says will reach as cold as 15 millikelvins, an important step in the IT giant’s plans for the 2029 introduction of Starling, its first fault-tolerant quantum system that will be designed to hold as many as 200 logical qubits, be capable of up to 100 million quantum calculations – 20,000 times more than what IBM quantum computers can do today – and will come loaded with advancements in crucial areas like error correction and processor design.

The new cryogenic infrastructure comprises two modules that combined are more than eight feet tall and eight feet wide and, when connected together, create the crucial ultra-cold environment – down to 4 Kelvins, which is the temperature of liquid helium, in fewer than five days, and its final temperature of 15 millikelvin, or more than 100 times colder than outer space, soon after.

It not only delivers the temperatures necessary for superconducting quantum computing, but is a significant architectural step necessary for scaling quantum systems, according to Jerry Chow, IBM Fellow and chief technology officer for quantum-centric supercomputing for IBM, who with Oliver Dial, IBM Fellow and vice president of quantum systems, unveiled the infrastructure (below).

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“It's a real physical architecture for fault-tolerant quantum computing and the success in being able to actually connect these modules really demonstrates the complex engineering that we need to go in terms of pushing beyond just single quantum processor,” Chow told journalists, noting the key role the modular, box-shaped design will play in IBM’s aggressive quantum roadmap for Starling and beyond.<br>“When we talk about scaling, it is not just about building bigger and bigger chips at the processor level,” Chow said. “It is really about all the infrastructure and the supporting pieces around it as well in the system. This is our first shared ultra-cold environment that allows multiple chips within to be connected together. It really provides enough space for all the high-density wiring that's needed. We're really starting to architect the entire system around for one unified powerful system.”<br>He added that addressing the crucial cooling needs means the architecture will allow IBM scientists to more quickly innovate and build future quantum systems, driving “quicker cycles of learning so that we can iterate and find things as we design everything around it and co-design it with the underlying processors and other architectures. That lets us really stay on track with our quantum roadmap and really deliver the world's most powerful quantum computer.”

The modular design also means the cyrogenic system can be decoupled, making it easier to ship to customer sites and put back together to “build a system that is arbitrarily large,” Dial said, adding that Starling will likely have about a dozen of the connected modules.

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The modules have doors that can open for maintenance and installation. The edges of the doors include a metal EMI gasket for keeping out electromagnetic radiation radio waves that can disturb the quantum processors inside, and a rubber O-ring to create a vacuum seal. There’s also a sheet that Dial said the scientists call “super insulation,” comprising layers of mylar and serving as a heat shield. On the inside is a series of metal shields that deliver progressively lower temperatures, and a dilution refrigerator, the cryogenic device.<br>There is also ample space for the wiring needed for the system.<br>“One of the great things about this modular design is it lets us co-optimize the volume that's inside of here, the amount of...