A fidelity benchmark is a metric that compares the expected output of a quantum circuit with the output actually observed during a run. Higher fidelity means the result is closer to the ideal model, while lower fidelity suggests noise, backend drift, or a poor simulation fit.
In cyber security, fidelity benchmarks matter because they help validate whether a quantum service, emulator, or hybrid workflow can be trusted. Security teams use them to spot backend misconfiguration, unexpected behavior, or manipulations that change how circuits are executed and measured. In practice, an attacker does not need to alter the code to cause problems; changing the execution environment, noise model, or measurement path can degrade results and hide errors. Fidelity checks give defenders a way to compare claims against observable behavior and judge whether a platform is reliable enough for sensitive workloads.