Quantum technology firms are defying turbulent markets to go public this year, as companies seek to raise funds to capitalize on recent scientific breakthroughs and push the experimental tech closer to commercialization. One such firm, Xanadu Quantum , which builds quantum computing hardware and software, began trading on the Nasdaq and Toronto Stock Exchange on Friday, rallying 15% in the U.S. after a rocky start in public markets. Xanadu Quantum — a quantum partner of chip giant Nvidia —