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

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Figure 4. Wigner Function for a Vacuum (top) and for a Coherent State (bottom). This
clearly shows that coherent states are just "displaced vacua" (Sect. IIB-3). Optical homodyne
tomography was used to reconstruct the Wigner functions from experimental data (courtesy of Ulf
Leonhardt).
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