Perturbation theory of von Neumann entropy |
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| Authors: | Chen Xiao-Yu |
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| Affiliation: | College of Information and Electronic Engineering, Zhejiang Gongshang University, Hangzhou 310018, China |
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| Abstract: | In quantum information theory, von Neumann entropy playsan important role; it is related to quantum channel capacities.Only for a few states can one obtain their entropies. In acontinuous variable system, numeric evaluation of entropy is not easydue to infinite dimensions. We develop the perturbation theory forsystematically calculating von Neumann entropy of a non-degeneratesystem as well as a degenerate system. |
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| Keywords: | von Neumann entropy perturbation degeneratestate |
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