Send us Fan Mail Like its cousin AGI, quantum computing, which harnesses the quantum states of subatomic particles to perform impossibly difficult computations at lightning speed, is a new-ish technology that many of its proselytizers believe is thisclose to reality. The “quantum supremacy” of this new technology over classical computing promises stunning breakthroughs in areas as disparate as drug development, materials science, weather forecasting, and cybersecurity. Is it for real, t...