Investor Sentiment Pivots as Funding, M&A and Research Advances Spark Interest During Q2 2025

Insider Brief

• Q2 2025 marked a potential turning point for quantum computing, with $1.16 billion in private investment and major technical, commercial, and policy milestones, according to The Quantum Insider’s Q2 2025 report.
• Key deals included SandboxAQ’s $450 million raise, IonQ’s $1.075 billion acquisition of Oxford Ionics, and new advances from IBM, Microsoft, and Quantinuum on fault-tolerant quantum systems.
• Momentum was further bolstered by supportive government actions, high-profile endorsements, and signs the industry is transitioning from research to real-world deployment.

Don’t call it a comeback.

The second quarter of 2025 may have marked a turning point in the global quantum computing industry, as a wave of investor activity, high-profile acquisitions, and key technical and scientific milestones signaled growing confidence in the sector’s near-term potential, according to a new report from The Quantum Insider.

Total private capital investment in quantum startups surged to $1.16 billion in Q2 2025, a 50% increase over the same quarter last year. The quarter’s deal volume remained consistent with Q1, continuing the recent trend of fewer but larger funding rounds. Among the biggest was Multiverse Computing’s $215 million raise to commercialize a quantum-inspired AI compression tool for large language models. The Spain-based company claims its CompactifAI software can shrink LLMs by up to 95% without sacrificing performance.

The funding wave extended to hardware players. Infleqtion, which builds atom-based quantum systems, raised a $100 million Series C round to expand its field-ready offerings in quantum computing, sensing, and timing. Meanwhile, SandboxAQ — focused on quantum-safe cybersecurity and enterprise AI — closed a $450 million Series E round backed by investors including Ray Dalio, BNP Paribas, Google, and NVIDIA.

Qunnect, another standout, closed a $10 million Series A extension led by Airbus Ventures and Cisco Investments to support deployment of its quantum-secure networking hardware. The company was the first to implement quantum entanglement-based protocols over commercial fiber.

Beyond funding rounds, the report that several public companies in the quantum space used the surge in interest in the technology to conduct work for equity offers during the quarter.

M&A Activity

Beyond funding, Q2 also featured significant merger and acquisition activity. IonQ, the only major publicly traded quantum company in the U.S., announced it will acquire Oxford Ionics for $1.075 billion in stock and cash. The deal combines IonQ’s commercial experience with Oxford Ionics’ semiconductor-based trapped-ion qubit systems, potentially accelerating scalability.

Pasqal, the French neutral-atom quantum startup, acquired Canadian photonics chipmaker AEPONYX to bolster its hardware capabilities. The deal gives Pasqal access to specialized photonic integrated circuits, which the company says are critical to its fault-tolerant quantum computing roadmap.

Inflection Point

Investor and industry sentiment also appeared to shift in Q2, aided by new product announcements and endorsements from once-skeptical voices. NVIDIA CEO Jensen Huang, who last year warned that useful quantum computers might be two decades away, reversed course during a June keynote, saying the technology is nearing an “inflection point.” The report flags this change as emblematic of broader momentum, citing new technical progress from IBM, Microsoft, and Quantinuum.

IBM’s updated roadmap for large-scale, fault-tolerant quantum computers calls for delivery of its Quantum Starling system by 2029. The company says it will perform 20,000 times more operations than current machines and be hosted in a new facility in New York.

Microsoft researchers published new designs for “4D geometric codes,” which promise to simplify quantum error correction and reduce the number of physical qubits needed for fault-tolerant computation. Quantinuum also reported it had demonstrated a universal gate set that is both scalable and fault-tolerant, a milestone the company framed as a transition from the NISQ (noisy intermediate-scale quantum) era toward utility-scale performance.

Policy shifts also played a role. U.S. lawmakers held a June hearing focused on the quantum threat to cybersecurity, calling for urgent modernization of cryptographic infrastructure. In parallel, the UK government committed £500 million (roughly $672 million) to quantum computing efforts as part of a national industrial strategy aimed at sovereignty and resilience.

Altogether, the quarter’s developments suggest — in the least — a change in tone for an industry long defined by hype cycles and cautious optimism. At The Quantum Insider, we characterizes this period as a potential inflection point — not only for technological progress but for broader economic validation of the sector. Continual progress on the path is not inevitable, however, and it’s advised to keep a close eye on industry news and moves as we move into 2025 and beyond.

You can read The Quantum Insider’s 2Q 2025 report here.