Quantum Darwinism in quantum Brownian motion: the vacuum as a witness

Details Quantum Darwinism in quantum Brownian motion: the vacuum as a witness Quantum Darwinism in quantum Brownian motion: the vacuum as a witness

2007-04-26

arxiv.org/abs/0704.3615v1

Phys.Rev.Lett.101:240405,2008

Physics

Quantum Physics

5 pages

Scientific paper

10.1103/PhysRevLett.101.240405

We study quantum Darwinism -- the redundant recording of information about a decohering system by its environment -- in zero-temperature quantum Brownian motion. An initially nonlocal quantum state leaves a record whose redundancy increases rapidly with its spatial extent. Significant delocalization (e.g., a Schroedinger's Cat state) causes high redundancy: many observers can measure the system's position without perturbing it. This explains the objective (i.e. classical) existence of einselected, decoherence-resistant pointer states of macroscopic objects.

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