As of September 2012, Dwave Systems is able to use 442 qubits on its 512 qubit adiabatic quantum computer chip

The qubit count of D-Wave’s quantum processors have been increasing exponentially since the first chip. This animation takes a tour of the chips leading up to the latest processor: ‘Vesuvius’.

From 2 minutes into the video, the statement of 442 qubits reached this month

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