No company blew an earnings call. No contract fell through. Quantum computing stocks are sliding anyway, and the culprit is sitting in the bond market, not the boardroom. Quantum computing stocks are getting hit because the bond market is making patience more expensive. According to Barron's, the 10-year Treasury yield reached 4.71% on Thursday as stocks sold off and investors worried about higher borrowing costs. That number is the story. IonQ fell 6.7% to $40.46 on Thursday, Weiss Ratings reported, and the rest of the pure-play quantum basket was under the same pressure. Rigetti, D-Wave and Quantum Computing Inc. don't need a company-specific disaster to fall on a day like that. They only need rates to rise. You don't need a finance degree to understand the hit. IonQ, Rigetti, D-Wave and Quantum Computing Inc. are long-duration stocks: companies whose valuations depend heavily on profits investors hope will arrive years from now. Not this quarter. Not next year. Years away. When a safe 10-year Treasury pays close to 4.7%, the market asks a harder question of every distant-growth story: why wait for uncertain cash when boring cash already pays? That question lands hardest on quantum. The technology may become important in drug discovery, materials science, security and optimization, but the public companies selling the story are still early in the commercial cycle. IonQ has real revenue and a more visible customer base than some peers, but it still trades on expectations more than present earnings. Rigetti and D-Wave are selling access to machines and systems while the market is still working out how large near-term demand really is. Quantum Computing Inc. is even more speculative. When rates rise, investors don't treat those differences kindly. They sell the whole group first. The selloff started before Thursday This wasn't one bad session coming