Physics – Quantum Physics
Scientific paper
2002-10-11
J. Opt. B: Quantum Semiclass. Opt. 5 (2003) S290
Physics
Quantum Physics
18 pages, 7 figures
Scientific paper
10.1088/1464-4266/5/3/360
We analyze the coherence properties of neutron wave packets, after they have interacted with a phase shifter undergoing different kinds of statistical fluctuations. We give a quantitative (and operational) definition of decoherence and compare it to the standard deviation of the distribution of the phase shifts. We find that in some cases the neutron ensemble is more coherent, even though it has interacted with a wider (i.e. more disordered) distribution of shifts. This feature is independent of the particular definition of decoherence: this is shown by proposing and discussing an alternative definition, based on the Wigner function, that displays a similar behavior. We briefly discuss the notion of entropy of the shifts and find that, in general, it does not correspond to that of decoherence of the neutron.
Facchi Paolo
Mariano Albert
Pascazio Saverio
Suda Martin
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