3 Top Quantum Computing Stocks to Buy in October

The quantum computing sector is rapidly advancing, with pure-play IonQ recently achieving the #AQ 64 milestone, signaling significant progress toward commercial viability despite current unprofitability. Concurrently, Alphabet is aggressively developing its in-house quantum capabilities, highlighted by its Willow chip's December breakthrough, to enhance cloud computing profitability and reduce reliance on external vendors. These developments underscore the sector's increasing strategic importance and growth potential for investors.

Analysis

Key Points - IonQ is the leading quantum computing pure play. - Alphabet has nearly unlimited resources to develop a viable quantum computing chip. - Nvidia is bridging the gap between traditional and quantum computing. The quantum computing space is really starting to heat up. Many of the top picks surged during September, leaving investors wondering if there's still room for these stocks to run during October and throughout the end of the year. I think there's a high likelihood of this occurring, as quantum computing is shaping up to be a huge theme in the market during 2026. I've got three top quantum computing stocks investors will want to pick up during October, and they cover a broad range in the quantum computing industry. IonQ IonQ (NYSE: IONQ) is one of the most popular quantum computing stocks on the market. It received a bit of fame by being the first quantum computing pure play to go public, and the stock has been a massive success. Since its IPO, it's up nearly 500%. However, a large chunk of that performance has come recently, as it's starting to announce increased breakthroughs in quantum computing. Its most recent innovation, which it announced on Sept. 25, was meeting the milestone of AQ 64, which means that the system is capable of 18 quintillion (2 to the 64th power) possibilities. This achievement brings IonQ one step closer to achieving commercial relevance, which it must do before it becomes a successful investment. IonQ has a lot of hype building around the stock, but it's far from profitable, and its quarterly revenue only comes from research contracts. That could flip in the near future if a large-scale commercial client sees value in its technology over traditional computing methods. Most quantum computing companies point to 2030 as the date when that might occur. Still, if IonQ can continue innovating at this rate (it crossed the AQ 36 milestone only nine months ago), quantum computing could become viable much sooner than that. IonQ is a risky bet in the quantum computing space, but if it works out, it could make investors a ton of money. Alphabet Another quantum computing competitor is Alphabet (NASDAQ: GOOG) (NASDAQ: GOOGL). Alphabet initially kicked off the quantum computing investment rush last December when it announced that its Willow quantum computing chip had completed a task that would have taken the world's most powerful supercomputer 10 septillion (10 to the 25th power) years to complete. Quantum computing is an incredibly important technology for Alphabet to develop, as it would allow Alphabet to increase the profitability of its cloud computing division. Currently, Alphabet purchases computing units from a few vendors, which means it must pay for that company's profits. If Alphabet develops in-house quantum computing capabilities and doesn't need to purchase computing units from a supplier like IonQ, it will become far more profitable. The quantum computing sector is demonstrating significant momentum, driven by technological breakthroughs that are attracting strong positive investor sentiment. IonQ, as the primary pure-play in the public markets, has seen its valuation surge nearly 500% since its IPO, propelled by key technical achievements. Its recent AQ 64 milestone, reached just nine months after achieving AQ 36, signals an accelerating innovation cycle that could potentially bring forward the timeline for commercial viability from the commonly cited 2030 target. However, this progress is set against a challenging financial backdrop, as IonQ remains unprofitable with revenue currently derived solely from research contracts. In parallel, Alphabet is pursuing a strategic imperative to develop in-house quantum capabilities, exemplified by its Willow chip's performance. This initiative is aimed at bolstering the profitability of its core cloud division by reducing dependency on third-party hardware suppliers, thereby positioning Alphabet as a major competitor and a potential threat to the long-term addressable market for companies like IonQ.

Key Decisions for Investors

• Evaluate exposure to the quantum sector based on risk profile: consider IonQ for a high-risk, pure-play bet on technological adoption, or Alphabet for diversified exposure where quantum serves as a long-term catalyst for its core cloud business.
• For IonQ, the key forward-looking indicator is the transition from research-based revenue to initial commercial contracts, which would serve as the primary validation of its path to profitability.
• Monitor the strategic threat posed by large-cap competitors like Alphabet, whose development of in-house quantum computing could limit the addressable market for pure-play hardware providers in the long run.
• Given IonQ's significant stock appreciation, investors should be cautious of valuations that are heavily dependent on future breakthroughs and sentiment rather than current financial fundamentals.