Fig. 3: Junction and shuttling sequence.

a Schematic diagonal view of the junction connecting two \({x}^{{\prime} }\) and two \({y}^{{\prime} }\) submodules. b Top view of the junction. c Shuttling sequence from \({x}^{{\prime} }\) submodule at the left to \({y}^{{\prime} }\) submodule at the bottom. Arrows indicate three consecutive spin shuttling operations (i–iii), followed by a Swap operation, and another three consecutive spin shuttling operations (v–vii). d Same as c, abstracted. e Hardware topology of the junction. Qubits (dots) of \({x}^{{\prime} }\) and \({y}^{{\prime} }\) submodules are connected via six shuttling and one Swap operations (lines).