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Objectivity in a noisy photonic environment through quantum state information broadcasting.

J K Korbicz1, P Horodecki2, R Horodecki1

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Classical objectivity emerges in quantum states even with environmental noise. This study shows robust information broadcasting, revealing "singular points" for reliable classical message transmission.

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Area of Science:

  • Quantum physics
  • Quantum information theory
  • Quantum foundations

Background:

  • Classical objectivity in quantum states was previously derived for pure environmental states.
  • The robustness and generality of this emergence under noisy conditions remained an open question.

Purpose of the Study:

  • To investigate the emergence of classical objectivity in quantum states within a noisy environment.
  • To explore the conditions for robust information broadcasting and quantum Darwinism.
  • To identify mechanisms for reliable classical communication through decoherence.

Main Methods:

  • Analysis of a small quantum object interacting with a noisy photonic environment.
  • Derivation of the spectrum broadcast form under non-pure environmental states.
  • Investigation of mutual information limits to characterize information proliferation.
  • Identification of decoherence "singular points".

Main Results:

  • The emergence of classical objectivity and the broadcast structure persists despite initial environmental noise.
  • A quantum Darwinism-type condition is established, quantifying classical information proliferation.
  • "Singular points" in decoherence are identified as crucial for faithful classical message broadcasting.

Conclusions:

  • Classical objectivity is a robust feature of quantum states, emerging even in the presence of environmental noise.
  • The framework supports quantum Darwinism principles and quantifies information redundancy.
  • Decoherence singular points offer a novel pathway for secure classical communication in noisy quantum systems.