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• W3098734011 abstract "Practical measures of electronic decoherence, called distilled purities, that are applicable to many-body systems are introduced. While usual measures of electronic decoherence such as the purity employ the full $N$-particle density matrix which is generally unavailable, the distilled purities are based on the $r$-body reduced density matrices ($r$-RDMs) which are more accessible quantities. The $r$-body distilled purities are derivative quantities of the previously introduced $r$-body reduced purities [I. Franco and H. Appel, J. Chem. Phys. 139, 094109 (2013)] that measure the non-idempotency of the $r$-RDMs. Specifically, the distilled purities exploit the structure of the reduced purities to extract coherences between Slater determinants with integer occupations defined by a given single-particle basis that compose an electronic state. In this way, the distilled purities offer a practical platform to quantify coherences in a given basis that can be used to analyze the quantum dynamics of many-electron systems. Exact expressions for the one-body and two-body distilled purities are presented and the utility of the approach is exemplified via an analysis of the dynamics of oligo-acetylene as described by the Su-Schrieffer-Heeger Hamiltonian. Last, the advantages and limitations of the purity, reduced purity and distilled purity as measures of electronic coherence are discussed." @default.
• W3098734011 created "2020-11-23" @default.
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• W3098734011 date "2017-06-05" @default.
• W3098734011 modified "2023-10-16" @default.
• W3098734011 title "Quantifying fermionic decoherence in many-body systems" @default.
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• W3098734011 doi "https://doi.org/10.1063/1.4984128" @default.
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