Complete Active Space Methods for NISQ Devices : The Importance of Canonical Orbital Optimization for Accuracy and Noise Resilience
To avoid the scaling of the number of qubits with the size of the basis set, one can divide the molecular space into active and inactive regions, which is also known as complete active space methods. However, selecting the active space alone is not enough to accurately describe quantum mechanical effects such as correlation. This study emphasizes the importance of optimizing the active space orbit