AAWSAP DIRD, Quantum Tomography of Negative Energy States in the Vacuum, January 2011

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Figure 6. Wigner Function of a Single Photon. The figure shows the experimentally
reconstructed Wigner function as seen from above (top) and from below (bottom).
Negative "probabilities" are clearly visible near the origin of the phase space, which demonstrates
the nonclassical aspect of photons (courtesy of Ulf Leonhardt).
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