IBM Connects Its First Modular Cryogenic Systems in Milestone Toward Fault-Tolerant Quantum Computing

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IBM has completed a foundational engineering milestone: two cryogenic modules, each standing over 8 feet tall and 8 feet wide, have been joined and successfully cooled to below 15 millikelvin (more than 180 times colder than deep space) in under 5 days. Each module's vacuum enclosure offers up to 12 times more wiring space than IBM's most widely deployed quantum systems, supporting denser chip-to-chip connections within and between units. IBM's 'L-coupler' technology links chips across modules so they can communicate and operate as components of a single, larger quantum computer. The new box-shaped modules are designed to stand side by side in expanding rows—each module's larger wiring capacity directly enables the inter-chip quantum links needed for fault-tolerant operation. IBM's 2026–2027 roadmap calls for Quantum Nighthawk processors to enter the modules later this year, followed by at least 1,000 programmable qubits via L-coupler-linked processors by 2027. At the Starling milestone in 2029, IBM plans for each module to house thousands of qubits. IBM Quantum Starling is expected to be the world's first fault-tolerant quantum computer, integrating advances in error correction, processor design, decoding, and systems engineering.