QUBT vs. IONQ: Which Quantum Stock Should You Buy, Hold or Sell Now?

Quantum Computing QUBT or QCi and IonQ IONQ are key quantum technology stocks pursuing commercial quantum computing. QUBT emphasizes room-temperature photonic systems, while IonQ focuses on trapped-ion quantum computing, making them two relevant quantum stocks for investors to consider amid the ongoing quantum boom. In the past six months, QUBT shares have risen 26.6%, while IONQ has gained 50.7%, compared with an 18.8% increase in the S&P 500.

During the second quarter, QCi’s revenues totaled $5.6 million compared with $61,000 in the second quarter of 2025 and $3.7 million in the first quarter of 2026. IonQ recognized $80.1 million in revenues during the quarter, 20% above the midpoint of its previously provided guidance and representing 287% year-over-year growth.

The Case for QUBT

QCi is expanding its manufacturing infrastructure with the launch of Fab 2 following its acquisition of NHanced Semiconductors. The expanded U.S.-based footprint could improve production flexibility, strengthen supply-chain resilience and support the development of advanced photonic chips for quantum computing, AI, networking, secure communications and defense applications.

QCi is also advancing its quantum computing strategy through Entropy Quantum Computing (“EQC”). Its Dirac-3 platform reflects the company’s focus on applying EQC to practical computing applications without relying on the highly controlled environments typically associated with conventional quantum systems.