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Uhlmann, Armin Uhlmann, Armin- Professor of Theoretical Physics, Institut für Theoretische Physik, Universität Leipzig, Germany. Życzkowski, Karol Życzkowski, Karol- Associate Professor at the Institute of Physics, Jagiellonian University, Kraków, Poland. Ekert, Artur Ekert, Artur- Professor of Quantum Physics, Mathematical Institute, University of Oxford, U.K. Tsomokos, Dimitris Tsomokos, Dimitris- Postdoctoral researcher in the Quantum Dynamics Group at Royal Holloway, University of London, U.K.