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Extension maps

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arxiv quant-ph/0503119 v1 pith:Z6XB5ZOC submitted 2005-03-12 quant-ph

classification quant-ph
keywords extensionmapspositivesystemcompletelyaddingancillarychanging
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We define extension maps as maps that extend a system (through adding ancillary systems) without changing the state in the original system. We show, using extension maps, why a completely positive operation on an initially entangled system results in a non positive mapping of a subsystem. We also show that any trace preserving map, either positive or negative, can be decomposed in terms of an extension map and a completely positive map.

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Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Identifiability of Autonomous and Controlled Open Quantum Systems

    quant-ph 2025-01 reject novelty 5.0 of 10

    The paper derives identifiability criteria for time-independent GKSL open quantum systems by mapping their measurement dynamics onto classical linear and bilinear dynamical systems and inverting the parameter map.

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