Quantum computing has captured the imagination of investors and tech enthusiasts alike, promising to revolutionize everything from drug discovery to cryptography. The intense spotlight has made a market darling out of IonQ (IONQ 2.38%), a pure-play quantum computing company. Even after a 45% price drop from its yearly highs last summer, the stock has more than doubled over the last year and trades at a mind-blowing 113 times sales. IonQ may have a stellar long-term future ahead, but it's still a highly spec ...