Open-source parallel implementations of RCCSDT, RCCSDT(Q), RCCSDTQ and UCCSDT in PySCF achieve near-ideal scaling to ~3000 cores and extend canonical high-order CC to systems with ~100 electrons in 450 orbitals.
Coupled-cluster techniques for computational chemistry: The
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High-performance parallel implementation of high-order coupled-cluster theories
Open-source parallel implementations of RCCSDT, RCCSDT(Q), RCCSDTQ and UCCSDT in PySCF achieve near-ideal scaling to ~3000 cores and extend canonical high-order CC to systems with ~100 electrons in 450 orbitals.