Quantum Supremacy? Google Claims 70-Qubit Quantum Supercomputer

Google says it would take the world's leading supercomputer more than 47 years to match the calculation speed of its newest quantum computer, reports the Telegraph:
Four years ago, Google claimed to be the first company to achieve "quantum supremacy" — a milestone point at which quantum computers surpass existing machines. This was challenged at the time by rivals, which argued that Google was exaggerating the difference between its machine and traditional supercomputers. The company's new