Otro
Emergence of the Pointer Basis through the Dynamics of Correlations
Registro en:
Physical Review Letters. College Pk: Amer Physical Soc, v. 109, n. 19, p. 5, 2012.
0031-9007
10.1103/PhysRevLett.109.190402
WOS:000310852000002
WOS000310852000002.pdf
Autor
Cornelio, M. F.
Jimenez Farias, O.
Fanchini, Felipe Fernandes
Frerot, I.
Aguilar, G. H.
Hor-Meyll, M. O.
de Oliveira, M. C.
Walborn, S. P.
Caldeira, A. O.
Souto Ribeiro, P. H.
Resumen
We use the classical correlation between a quantum system being measured and its measurement apparatus to analyze the amount of information being retrieved in a quantum measurement process. Accounting for decoherence of the apparatus, we show that these correlations may have a sudden transition from a decay regime to a constant level. This transition characterizes a nonasymptotic emergence of the pointer basis, while the system apparatus can still be quantum correlated. We provide a formalization of the concept of emergence of a pointer basis in an apparatus subject to decoherence. This contrast of the pointer basis emergence to the quantum to classical transition is demonstrated in an experiment with polarization entangled photon pairs. Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)