Non-Perfect Propagation of Information to a Noisy Environment with Self-Evolution

Area of Science:

• Quantum Information Science
• Quantum Measurement Theory
• Quantum Thermodynamics

Background:

• Studying non-ideal information propagation in quantum systems is crucial for understanding measurement and decoherence.
• The interplay between system evolution, initial state noise, and environmental parameters affects quantum objectivity.

Purpose of the Study:

• To analyze the relationship between objectivization degree and environmental parameters in a low-dimensional quantum system.
• To investigate how self-evolution and noisy initial states influence information propagation and quantum objectivity.

Main Methods:

• Developed an analytical model of three interacting qubits to derive objectivity parameters.
• Performed numerical analysis to study the impact of environment dynamics and mixedness on spectrum broadcast structure.
• Analyzed upper bounds on distance to states representing perfect objectivity for a higher number of qubits.

Main Results:

• Non-monotonicity in spectrum broadcast structure quality observed with changes in environment self-dynamics and mixedness.
• Increased external magnetic field on the environment can transform vague measurements into near-ideal ones.
• Quantum objectivity can emerge in a generalized pointer basis, not necessarily the standard one, by increasing environment dynamics.

Conclusions:

• Environmental dynamics and thermal noise play significant roles in achieving quantum objectivity.
• Increasing environmental self-dynamics can improve measurement quality and lead to objectivity in a generalized basis.
• Poor objectivity can be enhanced by increasing thermal noise, suggesting complex interactions in quantum information processing.