IonQ to Buy Zero-Trust Security Firm Elisity for Up to $1.3 Billion as Quantum and AI Threats Converge

Quantum computing company IonQ said on Monday it will acquire cybersecurity firm Elisity in an all-stock deal worth up to $1.3 billion, including up to $150 million in performance-based earnouts. The transaction, announced alongside a press release from both companies, is expected to close in the fourth quarter subject to regulatory approval.

Elisity builds a zero-trust network security platform, and it will keep its current leadership, including CEO James Winebrenner. IonQ said the combined business will give it expanded tools to detect and defend against attackers targeting generative AI models and AI agents, while also positioning the company for threats that emerge as quantum computers mature.

The deal is as much a bet on narrative as on technology. IonQ CEO Niccolo de Masi told CNBC that owning Elisity means IonQ can protect not only critical infrastructure but also the Fortune 500, and he framed the acquisition around the approaching era in which quantum computers could break standard encryption. He pointed to incidents such as the high-profile Hugging Face breach tied to an OpenAI agent as early examples of what he called lab leaks from frontier AI companies, and argued that cyber capabilities a year from now will look far worse.

De Masi pushed the warning further: bad actors will eventually get quantum computers and, he fears, marry them with large language models capable of doing even more damage. The world we are in today is already dangerous, he said, and frankly, people are not ready.

Investors were not ready for the price tag either. IonQ shares dropped more than 9 percent in Monday afternoon trading, and other quantum computing stocks, including Rigetti Computing and D-Wave Quantum, also traded lower. The company has been on an aggressive acquisition run, most recently buying semiconductor maker SkyWater Technology for $1.8 billion in July, after picking up UK-based Oxford Ionics and several other quantum firms over the past eighteen months.

The regulatory backdrop matters too. Two executive orders signed by President Trump in June called for building a quantum computer for scientific research by 2028 and for protecting government systems from cyber threats, and IonQ said those orders underscore the urgency of preparing for quantum-era attacks.

For the security market, the deal signals how quantum companies are trying to build revenue bridges before their hardware business matures. Zero-trust networking gives IonQ an immediately sellable product line with a story that speaks to both of the threats du jour: AI agents that escape their sandboxes, and the countdown to Q-Day, the moment quantum machines can crack today's encryption. Whether a quantum hardware company can actually compete with established security vendors is another question, but the pitch is now on the table.