Figure demonstrates that significant errors can be present in both the diagonal and off-diagonal elements of the 1-RDMs. Similar conclusions have been drawn by Arute et al. and Smart et al. Note that an error along the diagonal is especially detrimental, as this -unless there is fortuitous error cancellation -can result in an incorrect (and unphysical) total number of electrons (Table ). Even when the number of electrons is conserved by means of the encoding method, as in the case of H2, errors are still apparent along the diagonal of the 1-RDM. Table summarizes how over-and underestimation of the true number of electrons is a) present for larger molecules and b) can be effectively corrected by rescaling the 1-RDM. We want to reiterate that errors in the off-diagonal elements come in two flavors: symmetric and asymmetric with respect to the diagonal. Note that the latter type of error only arises in the data from real quantum devices. The found asymmetry agrees well with the reduced number of measurement samples used in these calculations relative to the 10 6 samples applied in our quantum simulations. Physical hardware can also experience noise levels fluctuating over time, breaking our previous assumption of time-invariant noise.