VQE	Variational Quantum Eigensolver
STO-3G	Slater-type Orbital basis set with each orbital expanded into 3 Gaussian functions.
6-31G	A double-zeta basis set, which uses six primitive Gaussians to describe each core
	atomic orbital. Further, each valence orbital is described by two basis functions.
	The first one is composed of a linear combination of 3 primitive Gaussian functions
	and the other one is composed of a single primitive Gaussian function.
SPSA	Simultaneous Perturbation Stochastic Approximation