We note that with the atomic realization of spin chains, with the spin-up and spin-down states corresponding to the hyperfine (Zeeman) sublevels of the ground electronic state, the preparation of the closed gate state or the coherent superposition of states and (assuming h=h−=0) can be accomplished by applying to a microwave or two-photon (Raman) optical pulse of proper area (π or π/2) and the frequency matching the energy difference δλ=2J2Δ between and . In turn, the initialization of the target spin state at the input port can also be done with resonant microwave or radiofrequency field(s), upon shifting the transition frequency of the atom by a focused laser3139, while the readout at the output port can be done by internal state selective fluorescence using the quantum gas microscope set-up4041. Both the initialization and the readout can be accomplished during time intervals ∼10 μs—short compared with ms transfer time39.