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

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Two-photon gateway in one-atom cavity quantum electrodynamics.

A Kubanek¹, A Ourjoumtsev, I Schuster

¹Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany.

Physical Review Letters

|December 31, 2008

Summary

A single atom in an optical cavity can absorb and emit photons in pairs, acting as a quantum two-photon gateway. This controlled photon interaction opens new avenues in quantum optics and photonics.

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Area of Science:

Quantum optics
Cavity quantum electrodynamics
Atomic physics

Background:

Single atoms typically absorb and emit photons individually.
Controlling photon interactions is crucial for quantum technologies.

Purpose of the Study:

To investigate if a single atom coupled to an optical cavity can alter photon emission patterns.
To demonstrate the creation of correlated photon pairs from a single atom-cavity system.

Main Methods:

Utilizing a single atom strongly coupled to an optical cavity.
Performing photon correlation experiments on transmitted light.
Analyzing the quantum anharmonicity of the atom-cavity system.

Main Results:

Observed single atoms absorbing and emitting resonant photons in pairs.
Demonstrated the atom-cavity system transforming random photons into correlated pairs.
Identified quantum anharmonicity as the origin of this two-photon effect.

Conclusions:

A single atom-cavity system functions as a two-photon gateway.
This system enables controlled interaction of photons mediated by a single atom.
Potential applications in quantum information processing and controlled photonics.