Promising unimaginable breakthroughs, quantum computing has long been talked about as a potentially society-changing technology. Now industry leaders say that an AI-style mainstream breakthrough is approaching reality. "Quantum computing is not going to be just slightly better than the previous computer, it's going to be a huge step forward," says Steve Brierley, founder of Riverlane, a UK company that has produced the world's first quantum decoder chip. IMAGES AND SOUNDBITES