According to the Australian Strategic Policy Institute’s critical technology tracker, China appears to be lagging more in quantum computers — which perform many calculations in one pass, making them faster than today’s digital computers that perform each calculation separately — while narrowing the gap in quantum sensing for navigation, mapping and detection. Chinese scientists have even said they are building a quantum-based radar to find stealth aircraft with a small electromagnetic storm, though quantum specialists outside China have questioned their claims. One of the doubters is Michael Biercuk, 43, the founder of Q-CTRL, an American physicist with a military mien...