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Quantum Darwinism in a Composite System: Objectivity versus Classicality.

Barış Çakmak1, Özgür E Müstecaplıoğlu2, Mauro Paternostro3

  • 1College of Engineering and Natural Sciences, Bahçeşehir University, Beşiktaş, İstanbul 34353, Turkey.

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Summary
This summary is machine-generated.

Quantum Darwinism in composite systems shows information transfer to the environment, with some parts preserving quantum properties. This reveals a split between objectivity and classicality in complex quantum interactions.

Keywords:
decoherenceopen quantum systemsquantum Darwinism

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Area of Science:

  • Quantum Information Science
  • Quantum Foundations
  • Condensed Matter Physics

Background:

  • Quantum Darwinism explains how classical objectivity emerges from quantum mechanics.
  • Composite quantum systems with decoherence-free subspaces present unique challenges to understanding information flow.

Purpose of the Study:

  • To investigate the implications of quantum Darwinism in a composite quantum system.
  • To analyze information proliferation and preservation in a two-qubit system interacting with an N-qubit environment.

Main Methods:

  • Analytical derivation of system dynamics for excitation-preserving interactions.
  • Analysis of quantum discord between the system and environment under different measurement schemes.

Main Results:

  • Identified redundant information proliferation to the environment from specific system subspaces.
  • Demonstrated preservation of non-classical signatures in decoupled subspaces.
  • Showed violation of strong Darwinism conditions due to non-zero quantum discord.
  • Revealed classical information transfer to the environment for environment-based measurements.

Conclusions:

  • Composite systems exhibit a dichotomy between objectivity and classicality.
  • The asymmetry of quantum discord plays a crucial role in information interpretation.
  • Quantum Darwinism's applicability is nuanced in systems with decoherence-free subspaces.