IBM’s new modular architecture for cryogenic systems

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IBM has announced a modular cryogenic architecture that fundamentally changes how quantum processors are housed and cooled. Rather than isolated cylindrical cryostats, the new box-shaped design allows modules to connect in tight rows, with each offering up to 12 times more wiring space than existing IBM quantum systems. This increased density supports more chip-to-chip connections both within and between modules. The company has already validated the approach by successfully joining and cooling two cryogenic cells together, demonstrating the architecture's core premise. The modular design supports at least 2,000 qubits per cryostat and enables multi-chip configurations using IBM's 'L-coupler' technology, which allows separate quantum chips to share information and operate as part of a larger system. This architecture is a foundational step toward IBM Quantum Starling—the company's target for the world's first fault-tolerant quantum computer, expected in 2029. IBM plans to install Quantum Nighthawk processors into the modules later this year. By 2027, the roadmap calls for using L-couplers to link multiple processors into a system with at least 1,000 programmable qubits. The technical challenge isn't just more qubits—maintaining quantum coherence at temperatures below 15 millikelvin across physically separate modules while preserving quantum links is the key engineering problem this architecture addresses.