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An IBM cryostat wired for a 50 qubit system. Credit: IBM

IBM has announced a milestone in its race against Google and other big tech firms to build a powerful quantum computer. Dario Gil, who leads IBM’s quantum computing and artificial intelligence research division, said it’s scientists have successfully built and measured a processor prototype with 50 qubits. Gil says it’s the first time any company has built a quantum computer at this scale.

This new processor expands upon the 20 qubit architecture and will be made available in the next generation IBM Q systems. Clients will have online access to the computing power of the first IBM Q systems by the end of 2017, with a series of planned upgrades during 2018...