Fig. 2
From: Coherent transfer of electron spin correlations assisted by dephasing noise
Experimental implementation of the spin chain. a Schematic of the spin chain with three sites studied in this work. b Schematic of a TQD device similar to the one measured, containing single-electron spins in each QD. The TQD is fabricated in a GaAs/AlGaAs heterostructure. The cobalt micromagnet deposited on a calixarene insulation layer is magnetized by an externally applied in-plane magnetic field of Bext = 0.7 T and it induces a difference of the local Zeeman energy ΔB12 (ΔB23) between QD2 and QD1 (QD3 and QD2). The spin states are manipulated by DC gate biases, pulse voltages, microwave signals, and thermal noise applied on finger gate structures. c Charge stability diagram of the TQD obtained by differentiating the rf-reflectometry signal of the nearby QD charge sensor. The yellow arrow shows the detuning axis along which the potential energy detuning ε between QD1 and QD3 is controlled by gate voltages P1 and P3. The bias points for spin initialization (I), operation (O), and measurements (M0,1) are marked by circles. d Energy diagram of the three-spin states. The Hamiltonian parameters are extracted from the energy spectroscopy in Fig. 4. The energy levels for S z = −1/2 and +1/2 are shown in the upper and lower panels, respectively (see Supplementary Fig. 3 for the S z = ±3/2 branches). Stars indicate the detuning values at which we measure the coherent evolutions plotted in Fig. 3
