What is Zero-Noise Extrapolation?

Question: What is the main idea behind Zero-Noise Extrapolation? A) Remove all physical qubits from the circuit B) Run circuits at different effective noise levels and extrapolate toward the zero-noise limit C) Replace quantum gates with classical sorting D) Measure the circuit only once Correct: B Explanation: Zero-Noise Extrapolation estimates what an observable would look like with less noise by intentionally evaluating the workload at multiple effective noise levels and extrapolating toward zero noise. Topic: quantum computing / error mitigation / ZNE