Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsPositive Wigner Function Transformation by Quantum Operationshttp://demonstrations.wolfram.com/PositiveWignerFunctionTransformationByQuantumOperations/]]>http://demonstrations.wolfram.com/PositiveWignerFunctionTransformationByQuantumOperations/