IBM has reached an important milestone in its strategy to build scalable, fault-tolerant quantum computers. Engineers have successfully connected and synchronously cooled two modular cryogenic systems, forming a unified superconducting environment. This technical achievement opens a direct path to combining hundreds of quantum chips within a single powerful infrastructure.
The key success metric is the speed and precision of cooling. The system reached the target temperature of 4 Kelvin in less than five days, after which it stabilized at an extremely low level—below 15 millikelvins. For comparison, this is hundreds of times colder than the temperature of outer space, which is critical for the stable operation of qubits.
Particular attention is warranted for the engineering solution with vacuum enclosures. Each of them provides up to 12 times more space for wiring compared to previous, most common IBM quantum systems. This radically increases the density of connections both within a module and between modules, removing the main "bottleneck" on the path to scaling.
At the core of the new architecture are innovative "L-couplers," providing direct communication between individual quantum chips. The next stage is scheduled for 2026: IBM Quantum Nighthawk processors will be installed in the modules for extended testing of this configuration.
The company's roadmap looks ambitious but consistent. By 2027, IBM plans to combine multiple processors via L-couplers into a system with at least 1000 programmable qubits. And by the launch of IBM Quantum Starling in 2029, the corporation expects to place thousands of qubits in each module. It is worth recalling that the Starling architecture was announced in 2025 along with a new error correction code, and the current achievement is another step in implementing the stated plan.
My view: Connecting cryogenic modules is not just an engineering curiosity, but a fundamental condition for transitioning from "noisy" quantum prototypes to commercially useful machines. Given IBM CEO Arvind Krishna's statement that investments in this direction will begin to noticeably impact financial results by 2028-2029, successful scaling now is a matter of market leadership in the coming decade.