Decoherence
Qubits forget, and two clocks set the deadline. T1 is the qubit falling to its ground state, T2 is the phase slipping away. Decoherence in plain words.
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15:45 Quantum Computing Why your qubits forget: decoherence in plain words
T1 is the qubit falling down, T2 is the phase slipping away. The two clocks that decide how long your circuit gets to run.