9,529 research outputs found
Simultaneous decomposition of two states
Simultaneous decompositions of a pair of states into pure ones are examined.
There are privileged decompositions which are distinguished from all the other
ones.Comment: 7 page
Fidelity preserving maps on density operators
We prove that any bijective fidelity preserving transformation on the set of
all density operators on a Hilbert space is implemented by an either unitary or
antiunitary operator on the underlying Hilbert space.Comment: This is corrected version of the paper math.OA/0108060. The paper has
already appeared in ROMP (vol. 48 (2001), 299-303
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