IBM announced today that it has successfully joined and cooled two of its new cryogenic quantum modules into a single environment, an engineering milestone on the company's stated path to delivering IBM Quantum Starling — expected to be the world's first large-scale, fault-tolerant quantum computer — in 2029.
Colder Than Deep Space, In A Box
Each of the two operational modules stands more than 8 feet tall and 8 feet wide. Initial tests, published on Zenodo, showed the joined pair cooling to 4 Kelvin (the temperature of liquid helium) in under five days and dropping below 15 millikelvin — more than 180 times colder than deep space — shortly after. Each module's vacuum enclosure offers up to 12 times more wiring space than IBM's most widely used quantum systems, enabling denser chip-to-chip connections both inside and between modules.
L-Couplers, Nighthawk And The 1,000-Qubit Milestone
The new box-shaped design lets modules line up in a tight row so IBM can bridge quantum processors with its "L-coupler" chip-to-chip technology. IBM's $10-billion quantum roadmap targets at least 1,000 programmable qubits by 2027 by using L-couplers to string multiple processors together. Later this year, IBM plans to slot new Nighthawk processors into the new modules to expand operational testing. By the time Starling ships, each cryogenic module is expected to house thousands of qubits.
Engineering, Not Just Physics
"Bringing fault-tolerant quantum computers to industries depends on several fundamental advances," said Jay Gambetta, Director of IBM Research and IBM Fellow, in the announcement. "The successful connection and operation of these cryogenic modules signals a leap forward in that direction and will accelerate our progress alongside continued innovation in quantum hardware, software, and algorithms." IBM says three essential components of the earlier Quantum System Two environment are now built into the new architecture as independent parts that can be tested and iterated separately — a shift that should compress its quantum roadmap cycle time.
Reporting based on the IBM Newsroom announcement and coverage from HPCwire and The Quantum Insider.