Figure 1
From: High-precision force sensing using a single trapped ion
(a) Time-evolution of the probability to find the system in spin state 
for the JC system. We compare the probabilities derived from the original Hamiltonian (3) (dots) and the effective Hamiltonian (4) (solid lines). We assume an initial thermal distribution with a mean phonon number 
= 1.2. The parameters are set to g = 4 kHz, ω = 170 kHz, Δ = g2/2ω, zax = 14.5 nm, F = 20 yN and Ω = 10 kHz. For the same initial state but in the absence of driving field (Ω = 0), the signal loses contrast (blue dashed line). (b) Contrast of the Rabi oscillations defined as S = P↑ (t2) − P↑ (t1) with t1 = π/2ΩF and t2 = π/ΩF with ΩF = 60 kHz as a function of the mean phonon number 
.
