Physics – Quantum Physics
Scientific paper
1999-12-13
Physical Review A 62 (2000) 012107 (6pp.)
Physics
Quantum Physics
16 pages
Scientific paper
10.1103/PhysRevA.62.012107
The Fisher information of a quantum observable is shown to be proportional to both (i) the difference of a quantum and a classical variance, thus providing a measure of nonclassicality; and (ii) the rate of entropy increase under Gaussian diffusion, thus providing a measure of robustness. The joint nonclassicality of position and momentum observables is shown to be complementary to their joint robustness in an exact sense.
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