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