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Google Reveals Blueprint For Quantum Supremacy

By Technology Review

October 10, 2017

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Researchers at the University of California, Santa Barbara (UCSB) and Google say they have outlined a way to achieve quantum supremacy, demonstrating a proof-of-principle version of a quantum computer.

UCSB's Charles Neill and Google's Pedram Roushan aim to create a 49-quantum bit (qubit) superposition, using superconducting qubits. Their proof-of-principle demonstration involved fabricating a chip with nine neighboring loops, illustrating that the superconducting qubits they support can simultaneously represent 512 numbers.

The chief outcome from the experiment is to show that errors do not scale rapidly in these superconducting chips. Instead, Neill and Roushan's team demonstrated the errors climb slowly in a manner that should enable the meaningful superposition of a maximum of 60 qubits.

"These results provide promising evidence that quantum supremacy may be achievable using existing technology," Neill and Roushan note. The implication is that it could be accomplished with a chip supporting 50 superconducting loops, if errors continue to scale appropriately.

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