Extended Data Fig. 1: Experimental data showing four-dot transfer of entangled states.

a, Schematic of the four-dot entangled-state transfer process. b, Interleaved data showing (I, ΔB, I), (S23, ΔB, S23) and (S23, S12, ΔB, S12, S23) measurements. c, Data from repetition 2, plotted on the same horizontal axis. d, Time evolution of the different magnetic gradients. Because the gradients result from different nuclear-spin configurations, they have different values and time evolutions. Error bars are fitting errors.