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Google sees quantum processor 'supremacy' at reach

Google (Mountain View, CA) has unveiled its latest quantum processor, which the company believes could ultimately achieve "quantum supremacy."

Mar. 09, 2018 – 

Called "Bristlecone," the new gate-based superconducting system is designed to provide a testbed for research into system error rates and scalability of the company's qubit technology, as well as applications in quantum simulation, optimization, and machine learning. The ultimate goal, say Google researchers, is to build a quantum computer that can be used to solve real-world problems.

"Our strategy is to explore near-term applications using systems that are forward compatible to a large-scale universal error-corrected quantum computer," says Julian Kelly, Research Scientist, Quantum AI Lab. "In order for a quantum processor to be able to run algorithms beyond the scope of classical simulations, it requires not only a large number of qubits. Crucially, the processor must also have low error rates on readout and logical operations, such as single and two-qubit gates."

The device is based on the underlying physics of the company's previous 9-qubit linear array technology and uses the same scheme for coupling, control, and readout, but is scaled to a square array of 72 qubits. The researchers are looking to achieve similar performance to the best error rates of the 9-qubit device - which demonstrated low error rates for readout (1%), single-qubit gates (0.1%), and two-qubit gates (0.6%) as a best result - but across all 72 qubits of Bristlecone.

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