Short Answer
Encoding logical qubits across many physical qubits to detect and correct errors is the best answer.
Quantum questions reward precision with language. Identify whether the prompt is about wave behaviour, measurement, states, operators, or quantised energy levels before choosing a formula or interpretation.
Quantum error correction encodes one logical qubit into multiple physical qubits (e.g., Shor 9-qubit code) to protect against decoherence.
Why This Answer Is Correct
This is a Hard-level question in Quantum Physics. The prompt is really testing whether you can connect the concept to its defining physical relationship instead of picking a nearby-but-wrong term.
When a quantum question feels ambiguous, translating it into state, observable, probability, and evolution language usually clarifies the answer.
Choices At A Glance
- A. Classical redundancy
- B. Encoding logical qubits across many physical qubits to detect and correct errors
- C. Only error-free states
- D. Repetition of measurements
When similar options appear on an exam, eliminate the ones that break the core law, use the wrong units, or confuse a definition with a consequence.
Topic Snapshot
Topic: Quantum Physics
Difficulty: Hard
Best next move: Re-state the governing law in your own words, then solve one more example from the same topic before moving on.