Investors shouldn't overlook this underappreciated quantum computing stock.When IonQ (IONQ -1.14%) went public by merging with a special purpose acquisition company (SPAC) in October 2021, it called itself the only "public pure-play" on the quantum computing market. It provides its quantum computing power as a cloud-based service, and it's shrinking down quantum processing units (QPUs) with its proprietary "trapped ion" technology.IonQ's stock started trading at $10.60 on the first day, nearly tripled to a ...