The rise and fall of redundancy in decoherence and quantum Darwinism Public Deposited

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  • A state selected at random from the Hilbert space of a many-body system is overwhelmingly likely to exhibit highly non-classical correlations. For these typical states, half of the environment must be measured by an observer to determine the state of a given subsystem. The objectivity of classical reality—the fact that multiple observers can agree on the state of a subsystem after measuring just a small fraction of its environment—implies that the correlations found in nature between macroscopic systems and their environments are exceptional. Building on previous studies of quantum Darwinism showing that highly redundant branching states are produced ubiquitously during pure decoherence, we examine the conditions needed for the creation of branching states and study their demise through many-body interactions. We show that even constrained dynamics can suppress redundancy to the values typical of random states on relaxation timescales, and prove that these results hold exactly in the thermodynamic limit.
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  • Riedel, C., Zurek, W., & Zwolak, M. (2012). The rise and fall of redundancy in decoherence and quantum darwinism. NEW JOURNAL OF PHYSICS, 14 doi: 10.1088/1367-2630/14/8/083010
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  • description.provenance : Approved for entry into archive by Deanne Bruner(deanne.bruner@oregonstate.edu) on 2012-09-17T20:23:20Z (GMT) No. of bitstreams: 1 ZwolakMichaelPhysicsRiseFallRedundancy.pdf: 1324732 bytes, checksum: 15f4c716e1df8b07ada0e949565b1387 (MD5)
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  • description.provenance : Submitted by Deanne Bruner (deanne.bruner@oregonstate.edu) on 2012-09-17T20:22:39Z No. of bitstreams: 1 ZwolakMichaelPhysicsRiseFallRedundancy.pdf: 1324732 bytes, checksum: 15f4c716e1df8b07ada0e949565b1387 (MD5)

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