Fig. 2 | Nature Communications

Fig. 2

From: Ultra-long coherence times amongst room-temperature solid-state spins

Fig. 2

\(T_2^ \ast\) and T2 in sample C. a Pulse sequence for a free-induction decay (FID) measurement, with a complete sequence illustrated at the bottom. b Result of FID measurement (data with blue crosses, sinusoidal exponential-decay fit with red line, \(T_2^ \ast = 1.54_{ - 0.50}^{ + 1.91}\) ms). Please note the breaks on the horizontal axis; all data are fitted with a single function. c Pulse sequence for a Hahn-echo measurement. When applying a final +π/2-pulse, the spin is rotated towards the |0〉 state (S|0〉 measurement); for a final −π/2-pulse, the spin is rotated towards the |1〉 state (S|1〉 measurement). d Results for the S|0〉 measurement (blue crosses) and for the S|1〉 measurement (cyan circles). The top and bottom black dashed lines correspond to a maximum population of the |0〉 and |1〉 states, respectively. The middle black dashed line is when both states are populated equally. e Echo signal derived from subtracting d’s S|1〉 from d’s S|0〉 (data with blue crosses, exponential-decay fit with red line, \(T_2 = 2.43_{ - 0.06}^{ + 0.06}\) ms). The dashed black line at 0 indicates when the states are populated equally

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