Question about 'Hamiltonian update' in step 14 in Algorithm 2

[dayanbatuofu]

Hi,

I have one question about the code setting for Algorithm 2. In the step 14 of Algorithm 2, H_i <-- H_i - \alpha_i \frac{D^{+}V_i - D^{-}V_i}{2}. However, the setting in the code is like this, e.g., the 3D system example shows that 'V_new[i, j, k] = -(V_new[i, j, k] - diss[0])'. I don't understand why this is a sign. Could you please explain this inconsistent setting? I appreciate your help and support.

Thank you.