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Related Experiment Video

Updated: Oct 11, 2025

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Violating Bell inequality using weak coherent states.

M Mahdavifar, S M Hashemi Rafsanjani

|December 1, 2021

Summary

This summary is machine-generated.

We experimentally show quantum interference with a continuous-wave laser. This demonstrates the violation of the Clauser-Horne-Shimony-Holt (CHSH) inequality, revealing quantum properties in classical states.

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Last Updated: Oct 11, 2025

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Area of Science:

Quantum Optics
Quantum Information Science

Background:

Two-photon interference is a fundamental quantum phenomenon.
Demonstrating quantum behavior in classical-like states is crucial for quantum technologies.

Purpose of the Study:

To experimentally investigate two-photon interference.
To demonstrate the violation of the Clauser-Horne-Shimony-Holt (CHSH) inequality.
To reveal the quantum nature of classical states.

Main Methods:

Utilizing a continuous-wave laser source.
Employing phase-randomized weak coherent states.
Performing experiments to test the CHSH inequality.

Main Results:

Successful observation of two-photon interference.
Experimental violation of the CHSH inequality confirmed.
Quantum characteristics identified in phase-randomized weak coherent states.

Conclusions:

Continuous-wave lasers can be used to demonstrate fundamental quantum phenomena.
The CHSH inequality violation highlights non-classical correlations in seemingly classical states.
This work provides an accessible approach to exploring quantum mechanics.