Extended Data Fig. 2: Variables extracted from fitting Eq. (3) to the measured signals for each exchange time t, as exemplified in Extended Data Fig. 3.
From: Strong coupling of alkali-metal spins to noble-gas spins with an hour-long coherence time
a. The change in alkali precession frequency ωa(t, τ = 0) [see Eq. (2)] manifests the change in the slowing-down factor due to alkali depolarization. b. The degree of alkali polarization pa(t) (in semi-log scale). In a and b, dashed black line correspond to the fitted multi-exponential model, and dotted lines present its confidence bounds. These are used as uncertainty estimations when using pa(t) to scale \(\langle \hat{a}\rangle\) and \(\langle \hat{b}\rangle\). Less reliable data, extracted when the excitations reside predominantly in the noblegas spins, are marked in gray. c. The two frequency components (amplitude squared) of the normalized Faraday rotation signal \({\overline{S}}_{x}(t+\tau )\). Note the factor of (Δ/J)2 ≳ 100 between them. Each data-point is averaged over 12 to 20 repetitions of the sequence.
