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This research introduces super mutual information (SMI) as a novel metric to quantify operator correlations within Hilbert spaces, enabling significant compression of vibrational and vibronic Hamiltonians without sacrificing accuracy. By efficiently identifying both direct and indirect couplings in quantum systems, this framework offers new tools for streamlining complex quantum simulations and advancing the scalability of quantum computing architectures.
Super Mutual Information Captures Operator Correlations Directly
The framework of operator Hilbert space is reviewed, introducing the one- and two-particle super reduced density matrices (1-SRDMs and 2-SRDMs), as well as the super mutual information (SMI). The SMI captures the correlation between operators acting on different one-mode subspaces, and may be used to reveal and quantify both direct and indirect couplings.
Researchers at the University of Ottawa and the National Research Council Canada review the framework of operator Hilbert space and introduce the one- and two-particle super reduced density matrices (1-SRDMs and 2-SRDMs), as well as the super mutual information (SMI). The eigenvectors of the 1-SRDMs define what they term natural single particle operator bases, and provide a way to compress vibrational and vibronic Hamiltonians with controlled error. The SMI is defined from the operator entanglement entropy of the 1-SRDMs and…
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