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Related Experiment Video

Updated: Apr 15, 2026

Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy

Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy

Published on: July 18, 2014

Macroscopic quantum state analyzed particle by particle.

Federica A Beduini¹, Joanna A Zielińska¹, Vito G Lucivero¹

¹ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860 Castelldefels (Barcelona), Spain.

Physical Review Letters

|April 11, 2015

Summary

This summary is machine-generated.

Researchers directly studied entanglement in macroscopic quantum phenomena. They confirmed strong entanglement in photon pairs from squeezed light, offering insights into many-body systems.

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Area of Science:

Quantum Physics
Many-Body Systems
Quantum Optics

Background:

Macroscopic quantum phenomena like superconductivity and squeezing are thought to arise from entanglement involving large numbers of particles.
Direct experimental evidence for this type of entanglement has been lacking.

Purpose of the Study:

To directly investigate entanglement in macroscopic quantum phenomena.
To experimentally verify predictions of spin-squeezing theory.

Main Methods:

Utilized discrete quantum tomography to reconstruct the joint quantum state of photon pairs.
Extracted photon pairs from polarization-squeezed light for analysis.

Main Results:

Provided the first direct study of entanglement in macroscopic quantum phenomena.
Confirmed strong entanglement between all photon pairs within the squeezing coherence time.
Observations align with predictions from spin-squeezing theory.

Conclusions:

The findings offer direct evidence for entanglement in macroscopic quantum systems.
Photon-by-photon analysis provides a method to study other macroscopic many-body systems, such as photon Bose-Einstein condensates.