Fig. 3: Quantum circuit for \({e}^{-i{H}_{21}t}\) and \({e}^{-i{H}_{201}t}\).
From: Synthesizing efficient circuits for Hamiltonian simulation

(a, b): Circuit simulating \({e}^{-i{H}_{21}t}\) (a) when a2t = a3t = a4t = a5t = θ1 and b2t = b3t = b4t = b5t = θ2; (b) when the coefficients are as in Equation 18. (c–e) Circuit simulating \({e}^{-i{H}_{201}t}\) (c) when a1t = a6t = − θ1, b1t = b6t = − θ2, a0t = a7t = θ1 and b0t = b7t = θ2; (d) when a0t = … = a7t = θ1 and b0t = … = b7t = θ2; (e) when the coefficients are as in Equation 18.