The Defiance Quantum ETF QTUM provides broad exposure and trades at roughly 23 times cash flow. Not cheap, but not insane for a sector where winners might return 50 times. It's up almost 40% so far ...

As Sundar Pichai, CEO of Google and its parent Alphabet (GOOGL) (GOOG), recently observed, quantum today is where AI was five years ago: poised to make a small number of people obscenely wealthy.