Fig. 3: Magnetic field dependence of the metastable region.
From: Observation of metastability in open quantum dynamics of a solid-state system
a Three-state jump signal of the 14N nuclear spin. The signal is observed when the magnetic field is close to the NV axis (θ = 2°), with a RIM duration τ = 374 ns and the number of repetitions m = 60 k. The red fitting line is extracted from the hidden Markov model. b The first 100 points of of three-state jump signal. The three plateau levels correspond to the states \({|+1\left.\right\rangle }_{n}\), \({| 0\left.\right\rangle }_{n}\), and \({| -1\left.\right\rangle }_{n}\) of the 14N nuclear spin. c Phase diagram for metastability. The metastable region for the number of measurements m depends on the orientation of the magnetic field. The dashed line marks the case of m = 60 k, with the two black triangles indicating experimental conditions used. The left point with θ = 2° gives the three-state jump signals explicitly shown in (a) and (b). The corresponding metastable region, quantified by the deviations of their eigenvalues from 1, is shown in the inset. The right point with θ = 8.8° corresponds to the two-state jump signal shown in Fig. 2a.
