Beyond real: alternative unitary cluster Jastrow models for molecular electronic structure calculations on near-term quantum computers
Nikolay V. Tkachenko, Hang Ren, W.M. Billings, Rebecca Tomann, K. Birgitta Whaley, Martin Head‐Gordon · Chemical Science · 2025
Im-uCJ and g-uCJ ansätze extend orbital rotations into complex space. Implemented exactly via generalized Givens rotations, these ansätze achieve higher accuracy and more robust optimization than the currently available Re-uCJ.