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Volume 574 Issue 7779, 24 October 2019

Quantum supremacy

In this week’s issue, John Martinis and his colleagues describe a significant step in the development of quantum computing. For the first time, the researchers have demonstrated experimentally that a programmable quantum computer can outperform the world’s most powerful conventional processors — a state known as quantum supremacy. The team used a quantum processor made up of 53 functional qubits to tackle a task that involved sampling the output of a quantum circuit generating random numbers, a task that becomes increasingly demanding the more qubits there are in the system. The quantum processor, dubbed Sycamore, was able to collect 1 million samples from the circuit in roughly 200 seconds, a feat that the authors estimate would take a state-of-the-art supercomputer around 10,000 years to perform. The cover shows an artistic rendering of the Sycamore chip.

Cover image: JVG

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