Fig. 6: Details of the circuit realization.
a Two generic elements with impedances ZA, ZB connected in series at either side of a negative impedance converter with current inversion (INIC) (elaborated in ref. 48) give rise to a non-Hermitian Laplacian Eq. (33). b Asymmetric couplings of the simplest form (Eq. (34)) can be realized with a parallel configuration containing one INIC and two capacitors. c An impurity bond consisting of tunable equivalently rescaled asymmetric couplings (Eq. (36)) can be realized with a variable inductor l connected in series with JNN. d, e Explicit example realizations of j0, jL grounding components needed to make the grounding terms of the impurity nodes equivalent to the others’. Changing the AC frequency ω leads to a uniform shift in Laplacian eigenvalues through \({(i\omega {l}_{{\mathrm{{gr}}}})}^{-1}\).
