Fidelity preserving maps on density operators
arXiv:math/0108060 · doi:10.1016/S0034-4877(01)80091-4
Abstract
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.
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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