Non-negative Wigner functions in prime dimensions

Details Non-negative Wigner functions in prime dimensions Non-negative Wigner functions in prime dimensions

2007-01-31

arxiv.org/abs/quant-ph/0702004v1

Appl. Phys. B 86, 367-370 (2007)

Physics

Quantum Physics

5 pages. Special case of a result proved in quant-ph/0602001. The proof is greatly simplified, making the general case more ac

Scientific paper

10.1007/s00340-006-2510-9

According to a classical result due to Hudson, the Wigner function of a pure, continuous variable quantum state is non-negative if and only if the state is Gaussian. We have proven an analogous statement for finite-dimensional quantum systems. In this context, the role of Gaussian states is taken on by stabilizer states. The general results have been published in [D. Gross, J. Math. Phys. 47, 122107 (2006)]. For the case of systems of odd prime dimension, a greatly simplified proof can be employed which still exhibits the main ideas. The present paper gives a self-contained account of these methods.

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