Perturbation theory of von Neumann Entropy

Details Perturbation theory of von Neumann Entropy Perturbation theory of von Neumann Entropy

2009-02-27

arxiv.org/abs/0902.4733v1

Chin. Phys. B Vol. 19, No. 4 (2010) 040308

Physics

Quantum Physics

7 pages

Scientific paper

In quantum information theory, von Neumann entropy plays an important role. The entropies can be obtained analytically only for a few states. In continuous variable system, even evaluating entropy numerically is not an easy task since the dimension is infinite. We develop the perturbation theory systematically for calculating von Neumann entropy of non-degenerate systems as well as degenerate systems. The result turns out to be a practical way of the expansion calculation of von Neumann entropy.

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