Équipe de Recherche en Physique de l'Information Quantique


Abstract = {We study the role of the information deposited in the environment of
an open quantum system in course of the decoherence process. Redundant
spreading of information --- the fact that some observables of the
system can be independently "read-off" from many distinct fragments
of the environment --- is investigated as the key to effective
objectivity, the essential ingredient of "classical reality". This
focus on the environment as a communication channel through which
observers learn about physical systems underscores importance of
quantum Darwinism --- selective proliferation of information about
"the fittest states" chosen by the dynamics of decoherence at the
expense of their superpositions --- as redundancy imposes the
existence of preferred observables. We demonstrate that the only
observables that can leave multiple imprints in the environment are
the familiar pointer observables singled out by
environment-induced superselection (einselection) for their
predictability. Many independent observers monitoring the environment
will therefore agree on properties of the system as they can only
learn about preferred observables. In this operational sense, the
selective spreading of information leads to appearance of an objective
"classical reality" from within quantum substrate.},
Author = {Ollivier, H. and Poulin, D. and Zurek, W. H.},
Correct_Ref = {Yes},
Date-Modified = {2010-05-06 13:53:18 -0400},
Eprint = {quant-ph/0408125},
Journal = {Phys. Rev. A},
Keywords = {Decoherence; Quantum Theory; Foundations},
Local-Url = {OPZ05a.pdf},
Pages = {042113},
Read = {Yes},
Source = {H. Ollivier},
Title = {Environment as a Witness: Selective Proliferation of Information and Emergence of Objectivity},
Url = {http://www.arxiv.org/abs/quant-ph/0408125},
Volume = {72},
Year = {2005}}