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Journal of Accounting and Public Policy

Quantum information and accounting information: Their salient features and conceptual applications

Joel S. Demski, Stephen A. FitzGerald, Yuji Ijiri, Y. Ijiri, Haijin H. Lin

Published Jun 16, 2006• 30 citations
Publisher
DOI
10.1016/j.jaccpubpol.2006.05.004

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Based on the self-energy-functional approach proposed recently [M. Potthoff, Eur. Phys. J. B 32, 429 (2003)], we present an extension of the cluster-perturbation theory to systems with spontaneously broken symmetry. Our method applies to models with local interactions and accounts for both short-range correlations and long-range order. Short-range correlations are accurately taken into account via exact diagonalization of finite clusters. Long-range order is described by variational optimization of a ficticious symmetry-breaking field. In comparison with related cluster methods, our approach is more flexible and, for a given cluster size, less demanding numerically, especially at zero temperature. An application of the method to the antiferromagnetic phase of the Hubbard model at half-filling shows good agreement with results from quantum Monte Carlo calculations. We demonstrate that the variational extension of the cluster-perturbation theory is crucial to reproduce salient features of the single-particle spectrum.