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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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¹Laboratoire Kastler Brossel, ENS, 24 Rue Lhomond, 75231 Paris Cedex 05, France.

Physical Review Letters

|February 7, 2007

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Area of Science:

Quantum optics
Atomic physics
Cavity quantum electrodynamics

Background:

Three-level atoms in Lambda configuration are crucial for quantum optics.
Electromagnetically induced transparency (EIT) enables novel light-matter interactions.
Squeezed and correlated light are essential for advanced quantum measurements.

Purpose of the Study:

To investigate the generation of squeezed and correlated beams using three-level atoms.
To explore the potential for quantum nondemolition measurements.
To identify experimental parameters for tuning the system's behavior.

Main Methods:

Theoretical modeling of a realistic fully quantum three-level system.
Inclusion of cavity losses and spontaneous emission in the model.
Analysis of system behavior near electromagnetically induced transparency.

Main Results:

Demonstration of strongly squeezed bright beams and correlated beams.
Identification of input intensity as a tunable parameter for squeezing or quantum nondemolition (QND) devices.
Observation of ideal quantum correlations at a critical point with switching behavior in mean field intensities.

Conclusions:

The proposed system offers a viable method for generating useful quantum states of light.
The findings provide a direct comparison for future experimental validation.
The tunable nature of the system allows for versatile applications in quantum technologies.