Maximum quantum entropy method

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A maximum entropy method for analytic continuation is extended by introducing quantum relative entropy. This method is formulated in terms of matrix-valued functions and therefore invariant under arbitrary unitary transformation of input matrix. As a result, the continuation of off-diagonal elements becomes straightforward. Without introducing any further ambiguity, the Bayesian probabilistic interpretation is maintained just as in the conventional maximum entropy method. The applications of our generalized formalism to a model spectrum and a real material demonstrate its usefulness and superiority.
Publisher
AMER PHYSICAL SOC
Issue Date
2018-11
Language
English
Article Type
Article
Citation

PHYSICAL REVIEW B, v.98, no.20, pp.205102

ISSN
2469-9950
DOI
10.1103/PhysRevB.98.205102
URI
http://hdl.handle.net/10203/246688
Appears in Collection
PH-Journal Papers(저널논문)
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