Objective properties from subjective quantum states: environment as a witness.

@article{Ollivier2004ObjectivePF,
  title={Objective properties from subjective quantum states: environment as a witness.},
  author={Harold Ollivier and David Poulin and Wojciech H. Zurek},
  journal={Physical review letters},
  year={2004},
  volume={93 22},
  pages={220401}
}
We study the emergence of objective properties in open quantum systems. In our analysis, the environment is promoted from a passive role of a reservoir selectively destroying quantum coherence to an active role of amplifier selectively proliferating information about the system. We show that only preferred pointer states of the system can leave a redundant and therefore easily detectable imprint on the environment. Observers who-as is almost always the case-discover the state of the system… CONTINUE READING
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