The Best Quantum Computing Stock to Own If the Bubble Bursts (Hint: It's Not D-Wave, IonQ, or Rigetti)

The piece warns that high-flying, unprofitable pure-play quantum stocks look like a bubble that would see steep falls if it bursts — Rigetti (RGTI) has rallied ~6x in 12 months but posted a GAAP net loss of ~$201m and revenue down 18% in Q3 2025; D-Wave (QBTS) is up ~440% with Q3 revenue doubling but a $140m loss; and IonQ (IONQ) carries roughly a $19bn market cap despite a $1.1bn Q3 loss even as revenue rose 222% YoY. By contrast, diversified tech giants investing in quantum computing — Microsoft, Amazon and IBM — should withstand a pullback because their core cloud, software and services businesses drive revenue, while their quantum efforts (topoconductors, Ocelet chip, IBM’s Nighthawk) preserve optionality. The author identifies Alphabet (GOOG/GOOGL) as the best post‑bubble holding: Google Quantum AI’s Willow chip has advanced error correction and claimed a benchmarked quantum advantage, Alphabet’s core businesses (search, growing Google Cloud, Waymo) reduce downside risk, and its valuation (forward P/E ~23.3) is cheaper than pure‑play peers; author disclosures note positions and Motley Fool recommendations.

Analysis

The article argues quantum-computing pure plays look like a speculative bubble whose burst would cause sharp share-price declines; Rigetti (RGTI) rallied more than 6x in 12 months yet posted a GAAP net loss of roughly $201 million and an 18% revenue decline in Q3 2025, D-Wave (QBTS) climbed ~440% with Q3 revenue doubling but a $140 million loss, and IonQ (IONQ) trades near a ~$19 billion market cap despite a $1.1 billion Q3 loss and 222% YoY revenue growth. These figures illustrate valuations driven by investor hopes rather than current cash-flow fundamentals, making pure-play downside sensitive to any liquidity or growth disappointments.

Major diversified techs provide downside protection because quantum work is optionality on top of established revenue streams; Microsoft’s topoconductors and Azure support, Amazon’s e-commerce dominance plus AWS and the Ocelet chip effort, and IBM’s software/consulting mix with the upcoming Nighthawk give these firms operating resiliency if quantum enthusiasm fades. Their broader revenue bases reduce the probability that a quantum-sector pullback would imperil the core investment thesis.

The author singles out Alphabet (GOOG/GOOGL) as the best post-bubble holding: Google Quantum AI’s Willow chip is credited with solving a key error-correction issue and achieving a benchmarked quantum advantage (a calculation that the article says classical supercomputers would take ~10 septillion years to match), while Alphabet’s core businesses—search dominance, faster-growing Google Cloud, and Waymo—provide diversification; the stock’s forward P/E of ~23.3 and relatively modest price-to-sales versus pure plays support the claim that Alphabet offers a cheaper, lower-risk way to retain quantum upside.

Key Decisions for Investors

• Reduce direct exposure to unprofitable pure-play quantum names (RGTI, QBTS, IONQ) given extreme run-ups, large GAAP losses and revenue volatility;
• Reallocate toward large-cap techs with quantum optionality—consider increasing weight in Alphabet, Microsoft, Amazon or IBM where core businesses underpin valuation and quantum is downside-protecting optionality;
• Monitor near-term catalysts and risk indicators closely: quarterly revenue trends, cash burn and net-loss trajectories at pure plays, and product milestones (Willow, Nighthawk, Ocelet) that could change technical or sentiment narratives;
• Employ position sizing limits or hedges for speculative quantum exposure and wait for valuation compression or clearer path-to-profitability before adding to pure-play positions