Quantum computing platform IonQ announced Monday it will acquire cybersecurity firm Elisity in an all-stock transaction valued at up to $1.3 billion, including up to $150 million in performance incentives. The move aims to defend against attacks targeting generative AI large language models and AI agents, and to counter emerging quantum threats. The transaction is expected to close in the fourth quarter, pending regulatory approval. Following the announcement, IonQ's stock price fell by over 9%.