Fig. 2
Exchange oscillations across the mediator and non-local correlations. a Fraction of detected singlet outcomes, PS, acquired simultaneously for the left and right double dot, as a function of interaction time τ and pulse amplitude εM. The choice of detuning between inner dots, ε = −2 mV, corresponds to a symmetric operation point (cf. gray triangle in Fig. 3b). b Histograms of demodulated sensor voltages, when repeating a pulse cycle with τ = 2 ns many times, for three different choices of \(\varepsilon _{\mathrm{M}}^{{\mathrm{cc}}}\) as marked in panel (c). Counts bunch into four groups, each associated with a different combination of singlet (S) or triplet (T) measurement outcomes for the two double dots. Correlations within these single-shot measurement outcomes reveal the non-local nature of the interaction. c Joint probabilities of all four possible joint outcomes, as a function of the exchange-inducing pulse amplitude \(\varepsilon _{\mathrm{M}}^{{\mathrm{cc}}}\) for fixed interaction time τ = 2 ns. Here, \(\varepsilon _{\mathrm{M}}^{{\mathrm{cc}}}\)-pulses are defined similarly to εM-pulses, but with a different choice for the cross-compensation amplitudes (see Supplementary Note 1). Dashed line indicates the largest expected probability to detect TT for the maximally entangled state (see text)
