Figure 5
From: Nuclear shell-model simulation in digital quantum computers
Examples of main circuit blocks, separated by dashed boxes, in ADAPT-VQE for the simulation of \(^6\)Be. Left: preparation of the reference state defined in Eqs. (11) and (12). Middle: implementation of \(e^{-i\frac{\theta }{2} X_2X_3Y_4Z_5}\) using the CNOT staircase algorithm, one out of the many unitaries in the variational part of ADAPT-VQE. Right: circuit of the basis change \(M_{0123}\) needed to diagonalize \(h_{0123}\). The subcircuit in qubits \(q_2\) and \(q_3\) containing two CNOTs and a Hadamard gate H corresponds to the basis change \(M_{23}\).
