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Perturbation theory of von Neumann entropy |
Chen Xiao-Yu(陈小余)† |
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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Received: 11 April 2009
Revised: 05 June 2009
Accepted manuscript online:
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Fund: Project supported by the National
Natural Science Foundation of China (Grant No.~60972071), Science
and Technology Program of Zhejiang Province, China (Grant
No.~2009C31060). |
Cite this article:
Chen Xiao-Yu(陈小余) Perturbation theory of von Neumann entropy 2010 Chin. Phys. B 19 040308
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