Fig. 4: Quantum correlation of a single nuclear spin.
From: Quantum nonlinear spectroscopy of single nuclear spins
a–c show the third moment Si,i+p, i+p+q as a function of p for q = 7, 8, and 9 in turn. The purple symbols are experimental data. The orange curves are theoretical results with the fitting parameter r being the ratio of the amplitude of the third moment to the amplitude squared of the second moment (not shown). tc is the same as in Fig. 3a. d The factor r (purple symbols) obtained from fitting different data sets (see Supplementary Note 11). The blue line is the mean value of r, and the shadow area is within one standard deviation from the mean. The red (green) dashed line indicates the value rQ = 1 (rC = 1/2) for the total (classical only) correlations.
