(color online) Anti-Zeno effect with a single trapped ⁴⁰Ca⁺ ion. The duration t₂ for electron shelving is set as 8 μs. (a)–(c) The solid circles show the probability P₂ of state |2⟩ as a function of the number n of the inserted collapse measurements. They are the experimental results of implementing the sequence in Fig. 2(b) under the conditions of (a) m = −8, (b) m = −12, and (c) m = −16. For simplicity, the measurement intervals here are all set as τ = t_π. The solid squares show the state evolution without inserted measurements and the time duration 8 μs between coherent evolutions is reserved. (d) The transfer rate of |1⟩ → |2⟩ as a function of the interval τ between the adjacent measurements. The triangles are the experimental results obtained by repeating the sequence in Fig. 3(a) for various measurement intervals τ with Ω₁ = 0.097(2π) × 10⁶ and m = −8. The solid curves represent the theoretical results and the straight solid lines show τ = t_π. The inset shows the theoretical transfer rate as a function of interval τ from 0 to 9 μs, and the straight solid lines also show τ = t_π. Each point represents 500 experiments, and the error bars denote the error of the mean.