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The measure of how long a qubit maintains its quantum state before decoherence is called ________ Time.
Answer: Coherence
Coherence time (T1 for energy relaxation, T2 for phase decoherence) determines how many quantum operations can be performed before errors dominate. Longer coherence enables more complex algorithms. Improved via better materials, shielding, and error correction. Critical metric for comparing quantum hardware platforms.