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Operational approach to the Uhlmann holonomy

Aberg, Johan and Kult, David and Sjoqvist, Erik and Oi, Daniel K.L. (2007) Operational approach to the Uhlmann holonomy. Physical Review A, 75 (3). 032106. ISSN 1094-1622

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We suggest a physical interpretation of the Uhlmann amplitude of a density operator. Given this interpretation we propose an operational approach to obtain the Uhlmann condition for parallelity. This allows us to realize parallel transport along a sequence of density operators by an iterative preparation procedure. At the final step the resulting Uhlmann holonomy can be determined via interferometric measurements.