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Related Experiment Video

Updated: May 29, 2026

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids

Published on: December 4, 2017

Local realism of macroscopic correlations.

R Ramanathan¹, T Paterek, A Kay

¹Centre for Quantum Technologies, National University of Singapore, Singapore.

Physical Review Letters

|September 10, 2011

Summary

Quantum correlations in macroscopic systems can be explained by local realism. This occurs due to quantum entanglement

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.

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Last Updated: May 29, 2026

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Published on: December 4, 2017

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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.