The little quantum computing company still has a lot to prove.Rigetti Computing's (RGTI 0.67%) stock closed at a record high of $56.34 per share on Oct. 15, 2025. That marked a 6,850% gain over its previous 12 months, and was fueled by new contracts, analysts' upgrades, and a growing enthusiasm for quantum computing stocks.Yet over the following three months, Rigetti's stock was cut in half and now trades at about $26. Let's see why its stock fizzled out, and if that dip is a buying opportunity for patient ...