Extended Data Fig. 7: Three-site conductance spectra for different QD detuning combinations.

In a three-site Kitaev chain, the ZBPs arising on the outer QDs are expected to persist when detuning either a single QD or pairs of QDs²⁴. Figure 3 only demonstrates the response to detuning V_QDL. Here, four other possible detuning combinations are highlighted, for the same device configuration. Accompanying numerical simulations use the same set of parameters as shown in the main text. Plunger gate voltages have been converted to chemical potential energies using the QD leverarms. a. and b. show repetitions of the conductance spectra shown in Fig. 3, where ϕ_Δ = 0 and ϕ_Δ = π respectively, including a comparison to the numerical simulation. Furthermore, we show the response at ϕ_Δ = 0 to c. Detuning V_QDM (μ_M), d. detuning V_QDR (μ_R), e. detuning both V_QDL and V_QDR and f. detuning all three QDs simultaneously. When ϕ_Δ = 0, the ZBP measured in G_LL and G_RR only splits from zero-energy when all three QDs are detuned.