ZAPT2 frozen natural orbitals reduce virtual space for systematic convergence of open-shell T1-S0 gaps in CASCI and iQCC quantum eigensolvers, demonstrated on H2O2, O2, CH2 and Ir(ppy)3.
Kaufold, Nithin Chintala, Pratima Pandeya, and Sijia S
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SZ-QCT relaxes the small-generator limit of prior seniority-zero methods by retaining approximate four-body operators, yielding sub-millihartree accuracy for strongly correlated systems at O(N^8) scaling.
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Open-shell frozen natural orbital approach for quantum eigensolvers
ZAPT2 frozen natural orbitals reduce virtual space for systematic convergence of open-shell T1-S0 gaps in CASCI and iQCC quantum eigensolvers, demonstrated on H2O2, O2, CH2 and Ir(ppy)3.
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Seniority-zero Quadratic Canonical Transformation Theory
SZ-QCT relaxes the small-generator limit of prior seniority-zero methods by retaining approximate four-body operators, yielding sub-millihartree accuracy for strongly correlated systems at O(N^8) scaling.