International Business Machines ( IBM 0.05%), a quantum computing pioneer, now sees a path to full-scale quantum error correction by 2029 and true quantum advantage by the end of 2026. The company has a clear roadmap, and if it can deliver, quantum computing could turn into a major business for the century-old tech giant.

Quantum Computing Inc. (NASDAQ: QUBT) presents a fascinating paradox for investors to study. On one hand, it's a headline-grabbing technology stock whose valuation often seems disconnected from its current financial results.

As the promise of quantum computing inches closer to commercial reality, investors continue to hunt for early-stage opportunities in the space—especially through speculative plays like quantum computing penny stocks. While the mainstream spotlight remains on giants like IBM and Alphabet, several lesser-known names have seen major moves in 2025.