Quantum computing stocks were on a tear in 2025, but many of them still lack concrete fundamentals.Quantum computers use a concept called superposition to simulate several different solutions to a given problem. In theory, this can speed up highly complex workloads and lead to breakthroughs in areas like science and cryptography, which is why investors have piled into quantum stocks like Rigetti Computing (RGTI 2.39%) in 2025.However, most of the quantum computers available today still produce very high err ...