Position component of Wigner function flow: the figure shows its contours (floor) and projections along time (blue) and momentum (rose). Selected for an Editors' Suggestion.

From the article:

Wigner Flow Reveals Topological Order in Quantum Phase Space Dynamics
Ole Steuernagel, Dimitris Kakofengitis, and Georg Ritter
Phys. Rev. Lett. 110, 030401 (2013)

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