Phys. Rev. A 65, 032315 (2002) [4 pages]How much state assignments can differReceived 11 September 2001; published 22 February 2002 We derive necessary and sufficient conditions for a group of density matrices to characterize what different people may know about one and the same physical system. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.65.032315
DOI:
10.1103/PhysRevA.65.032315
PACS:
03.65.Ta, 03.65.Ca, 03.67.Hk
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