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Temporal Quantum Correlations in Inelastic Light Scattering from Water.

Mark Kasperczyk¹, Filomeno S de Aguiar Júnior², Cassiano Rabelo³

¹Photonics Laboratory, ETH Zürich, 8093 Zürich, Switzerland.

Physical Review Letters

|December 24, 2016

Summary

Researchers discovered that water can generate quantum-correlated photon pairs at room temperature through Raman scattering. This finding highlights water

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Area of Science:

Quantum physics
Optics
Chemistry

Background:

Water is a ubiquitous substance essential for life.
Water exhibits anomalous properties beyond its common chemical roles.
Quantum phenomena are typically observed under extreme conditions.

Purpose of the Study:

To investigate novel sources of quantum phenomena.
To explore quantum correlations in water at ambient conditions.
To assess the potential of water for quantum information applications.

Main Methods:

Photon pair generation via Raman scattering.
Analysis of Stokes and anti-Stokes scattering events.
Violation of Cauchy-Schwarz inequality to confirm nonclassicality.
Characterization of photon pair polarization properties.

Main Results:

Identified water as a source of quantum-correlated photon pairs.
Observed violation of Cauchy-Schwarz inequality by over 5 orders of magnitude.
Demonstrated well-defined polarization properties of photon pairs from water.

Conclusions:

Pure water can generate quantum-correlated photon pairs at ambient conditions.
The observed nonclassical correlations are significant and robust.
Water's unique properties make it a promising candidate for quantum information technologies.