GK Question

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The measure of how long a qubit maintains 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.

Topic Post-Quantum Cryptography
Exam Relevance UPSC, Banking, SSC