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Reconstructing a pure state of a spin s through three Stern-Gerlach measurements: II

By S. Weigert and Jean-Pierre Amiet


The density matrix of a spin s is fixed uniquely if the probabilities to obtain the value s upon measuring n.S are known for 4s(s+1) appropriately chosen directions n in space. These numbers are just the expectation values of the density operator in coherent spin states, and they can be determined in an experiment carried out with a Stern-Gerlach apparatus. Furthermore, the experimental data can be inverted providing thus a parametrization of the statistical operator by 4s(s+1) positive parameters

Year: 1999
DOI identifier: 10.1088/0305-4470
OAI identifier: oai:eprints.whiterose.ac.uk:1353

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