Is IonQ Stock a Buy After This 100-Qubit System Sale?

IonQ just sold a 100-qubit quantum system to South Korea. Here's why that's not enough to make me buy the stock.Quantum computing specialist IonQ (IONQ 6.52%) just landed a large system sale. The company will deliver a 100-qubit IonQ Tempo system to the Korea Institute of Science and Technology Information (KISTI), helping the South Korean research center develop hybrid quantum-classical computing methods. IonQ's press materials didn't specify any financial details, and it's unclear exactly when the top-of-the-line system will be delivered. The KISTI deal is still an impressive achievement, but it doesn't inspire me to buy or recommend IonQ's stock. ExpandNYSE: IONQIonQToday's Change(-6.52%) $-3.25Current Price$46.57Key Data PointsMarket Cap$18BDay's Range$46.13 - $49.5552wk Range$17.88 - $84.64Volume614KAvg Vol27MGross Margin-747.41% The million-qubit problem 100 qubits sounds impressive, given that IonQ's most powerful system in 2025 only has 36 qubits. However, 100 physical qubits still can't get much work done. Theoretical research shows that game-changing quantum computing tasks, such as breaking encryption or simulating molecular interactions, will require thousands of algorithmic qubits and many millions of physical qubit units. The difference is that physical qubits do the actual work, but their results tend to be noisy and require a ton of error correction. Hence, the number of qubits available to quantum computing algorithms is usually much smaller than the physical count. And of course, IonQ's Korean sale involved 100 physical qubits. After error correction, researchers get to experiment with 64 algorithmic qubits.Advertisement Image source: Getty Images. Priced for perfection in an imperfect world IonQ investors have been too excited about the stock in 2025. With an $18.3 billion market cap, IonQ trades at 229 times sales. It makes market darlings like Palantir Technologies and Strategy look cheap by comparison. Quantum computing may mint millionaires in the long run, but it's much too early to tell whether their money-making portfolios will feature any IonQ shares (or Rigetti, or D-Wave Quantum, and so on). These are the early days of a promising but difficult and risky business. IonQ's stock is priced for long-term perfection, and that's not a reasonable investment thesis. With or without the occasional 100-qubit system sale, IonQ's stock is far too risky, in my view.Read NextDec 26, 2025 •By Geoffrey SeilerDown 35%, Should You Buy the Dip on IonQ?Dec 23, 2025 •By Will HealyIs IonQ Poised to Be the Quantum Stock Worth $50 Billion in 5 Years?Dec 22, 2025 •By Rich SmithWhy IonQ Stock Popped TodayDec 20, 2025 •By Manali Pradhan, CFACould IonQ Reach $100 in 2026?

The Answer May Blow Your Mind.Dec 20, 2025 •By Lyle DalyShould You Invest $500 in IonQ Right Now?Dec 19, 2025 •By Manali Pradhan, CFABetter Quantum Computing Stock to Buy in 2026: IonQ vs. D-Wave QuantumAbout the AuthorAnders Bylund is a contributing Motley Fool media and technology analyst covering semiconductors, cloud computing, internet infrastructure, quantum computing, and streaming media. Previously, Anders was a systems administrator for Nielsen Technology and CSX, gaining hands-on experience with enterprise-class systems. He was also a freelance writer for Ars Technica, TIME, USA Today, CNN, WIRED, and AOL's Daily Finance. He holds a bachelor’s degree in English and a master’s degree in library and information sciences from Florida State University. He believes in coyotes and time as an abstract.TMFZahrimX@TMFZahrimStocks MentionedIonQNYSE: IONQ$46.57 (0.07%) $3.25*Average returns of all recommendations since inception. Cost basis and return based on previous market day close.Advertisement