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Nature 393, 133 (1998)

Why use electron spins in semiconductor as qubits?

electron spins in semiconductor can have very long coherence times

T1 up to 100 s

T2: natural Si (5% Si29) up to 0.25 ms, measured by G. Feher in 1958

Isotopically purified up to 3 sec! by S. Lyon’s group in 2011