Hybrid compute is a computing model where quantum hardware works alongside classical CPUs and GPUs, rather than replacing them. The quantum processor handles a narrow class of problems it may be good at, while classical systems manage orchestration, data movement, preprocessing, and most general workloads.
This matters in cyber security because it changes how defenders plan for future platforms. A hybrid stack may be used for optimization, sampling, or research tasks while sensitive data still flows through classical infrastructure, so security teams must protect both layers. In real-world defenses, hybrid compute encourages crypto agility, workload testing, and careful integration design. In attack scenarios, it can also affect how quickly adversaries can turn quantum advances into practical impact: the risk is not a magical standalone machine, but a system that could eventually assist attacks on public-key cryptography while relying on classical control and storage. For that reason, hybrid compute is best treated as an architectural shift with long-term security consequences.