Mechanism of Intermittent Single-Shot Fluctuations

Distinguishing spectral diffusion from charge-state ionization in cavity-coupled SiV centers

0.627
SD Stretch Exp beta
0.990
Ion. Stretch Exp beta
-637
Log Bayes (SD bright)
43.2%
HMM Accuracy (SD)

Temperature Dependence of Bright Duty Cycle

RMS Detuning vs Temperature

HMM Classification Accuracy

Coefficient of Variation Comparison

Dwell-Time Distribution Parameters

MechanismStatebetatau [s]log BF
Spectral Diff.Bright0.6270.831-637
Spectral Diff.Dark0.8180.263-118
IonizationBright0.9903.308+0.66
IonizationDark1.1580.518-13.2

Discrimination Metrics

MetricSpectral DiffusionIonization
CV (bright)1.6390.990
CV (dark)1.6270.880
Skewness (bright)2.9161.932
Kurtosis (bright)11.324.935
N bright dwells31811249
N dark dwells31421219
HMM accuracy43.2%41.3%
HMM log-likelihood-3109-3187
Data from stochastic simulation of SiV cavity QED | Reference: Yama et al., arXiv:2601.04733 (2026)