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Revealed: Google’s Plan for Quantum Computer Supremacy

New Scientist (08/31/16) Jacob Aron

Google expects to have the world’s largest working quantum computer ready soon, as researchers say the company is on the verge of a breakthrough. Hints were dropped in July when Google published a study in which it announced a plan to achieve “quantum supremacy” by building the first quantum computer that can perform a task beyond the capabilities of classic computers. Google publicly announced a 9-quantum-bit (qubit) system, but its goal is a 50-qubit computer that can model the behavior of a random arrangement of quantum circuits. “They’re doing a quantum version of chaos,” says Simon Devitt at Japan’s RIKEN Center for Emergent Matter Science. After pushing classical computing to its limit in the simulation of quantum circuit behavior on the Edison supercomputer to set the goal it hopes to achieve, Google hired University of California, Santa Barbara professor John Martinis to design superconducting qubits. Devitt thinks quantum supremacy could be achieved by the end of 2017, although meeting the challenge even within the next five years would still be a major accomplishment. Building a 50-qubit quantum device would be the first step toward a fully scalable machine, which Devitt says will indicate the technology is “ready to move out of the labs.”

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