IBM is planning to build the largest quantum computer so far, by linking together smaller machines to create one with a recording-breaking number of quantum bits, or qubits. The firm’s first steps on this path in 2025 should see it hit a new qubit record, and it eventually plans to more than triple the size of the largest existing quantum computer. It has only been six years since IBM unveiled its first commercial quantum computer. That device had 20 qubits, the basic building blocks of any quantum computer, and was available for researchers to use over the internet. Now, the company’s largest quantum chip, called Condor, has 1121 qubits, though IBM’s Jay Gambetta says the average user of its quantum computing services only works with 100 qubits. IBM isn’t the current record holder for most qubits – that goes to the start-up Atom Computing, which announced a 1180-qubit device in 2023 – but it is keen to regain the title, and is looking at new ways of doing so.
“We know we can’t just make Condor but 10 times bigger,” says Gambetta. “The only way to get quantum advantage is to combine different components.”

Full report : Following successful early demonstrations of linking two quantum computing chips, IBM is aiming to break records for the largest quantum computer yet by combining many of them in parallel.