. 2023 Jan 27;19(3):783–789. doi: 10.1021/acs.jctc.2c00807

Table 2. Comparison of Circuit Complexities for H₂, HeH⁺, LiH, and BeH₂ Listed in Order of Increasing Complexity^a.

Molecule	Ansatz	Qubits	Depth	Two-Qubit Gates	Parameters
H₂	Simplified UCCD	2	5	1	1
HeH⁺	UCCSD	2	14	4	2
LiH	Hardware-efficient	4	9	6	8
LiH	UCCSD	4	275	172	8
BeH₂	UCCSD	6	1480	1096	26

Details are provided in the SI.

Table 2. Comparison of Circuit Complexities for H2, HeH+, LiH, and BeH2 Listed in Order of Increasing Complexitya.