Composite Discordant States and Quantum Darwinism

Area of Science:

• Quantum Information Theory
• Quantum Foundations
• Quantum Many-Body Systems

Background:

• Quantum Darwinism explains the quantum-to-classical transition via information redundancy.
• Strong Quantum Darwinism and Spectrum Broadcast Structures refine this concept.
• Information proliferation in complex states remains an open area of research.

Purpose of the Study:

• To investigate information proliferation in a two-qubit system with initial quantum correlations (Quantum Discord).
• To analyze mediated redundancy, focusing on information about non-interacting subsystems reaching the environment.
• To explore how dephasing-like interactions affect information proliferation and channel capacity.

Main Methods:

• Modeling a two-qubit system with initial Quantum Discord.
• Simulating dephasing-like interactions with an observing environment.
• Quantifying mediated redundancy and channel capacity of subsystems.

Main Results:

• Demonstrated information proliferation from non-interacting subsystems to the environment.
• Observed that mediated redundancy can exceed the channel capacity of individual fragments in certain scenarios.
• Showcased the impact of dephasing-like interactions on information flow.

Conclusions:

• The study provides a deeper understanding of information proliferation mechanisms in multipartite quantum systems.
• Findings suggest that complex initial correlations can lead to non-intuitive information dynamics.
• The research opens avenues for exploring quantum-to-classical transitions in more intricate quantum states.