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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
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