What does a stabilizer syndrome reveal?

Question: In stabilizer quantum error correction, what does the syndrome measurement reveal? A) The exact unknown quantum state B) A perfect copy of the logical qubit C) The final answer of the quantum algorithm D) Information about which error occurred without directly measuring the encoded logical state Correct: D Explanation: Syndrome measurements detect error information while preserving the protected logical information. This allows correction procedures to infer likely errors without directly collapsing the logical state. Topic: quantum computing / stabilizer codes / syndrome measurement