Johan Aberg, David Kult, Erik Sjöqvist, D. K. L. Oi
Published 2006-08-24, updated 2007-03-10Version 2
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.
Comments: Added material, references, and journal references
Journal: Physical Review A 75, 032106 (2007)
Estimating the spectrum of a density operator
Quantum Theory: Interpretation Cannot be Avoided
Solving the Zeh problem about the density operator with higher-order statistics
