Local realism of macroscopic correlations

Area of Science:

• Quantum mechanics
• Statistical mechanics
• Foundations of physics

Background:

• Quantum correlations are typically non-local and violate local realism.
• Macroscopic systems involve a large number of particles (Avogadro number scale).
• Understanding the transition from quantum to classical behavior is a fundamental challenge.

Purpose of the Study:

• To determine the conditions under which quantum correlations in macroscopic systems adhere to local realism.
• To explain the emergence of classical behavior from underlying quantum mechanics at a large scale.

Main Methods:

• Theoretical analysis of quantum correlations in many-body systems.
• Investigating the implications of measurement on macroscopic quantum states.
• Examining the role of entanglement monogamy in macroscopic phenomena.

Main Results:

• Identified specific conditions where macroscopic quantum correlations are consistent with local realism.
• Demonstrated that the monogamy of quantum entanglement, combined with measurement limitations, leads to classical correlations.
• Showed that macroscopic measurements obscure individual particle properties, thus masking quantum effects.

Conclusions:

• Local realism can emerge at the macroscopic level despite underlying quantum mechanics.
• The interplay between entanglement properties and measurement practices dictates the observed correlations.
• This work bridges the gap between quantum phenomena and classical intuition in large systems.