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

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Steady State Entanglement in Cavity QED.

P R Rice, J Gea-Banacloche, M L Terraciano

|June 12, 2009

Summary

We studied steady-state entanglement in an open quantum system. Optimal atom-field coupling maximizes entanglement, with cross-correlation functions indicating its presence.

Area of Science:

Quantum Optics
Open Quantum Systems

Background:

Investigating steady-state entanglement is crucial for quantum information processing.
Open quantum systems, like atoms in driven cavities, are fundamental for studying quantum phenomena.

Purpose of the Study:

To explore steady-state entanglement in a single atom within a driven optical cavity.
To identify optimal conditions for maximizing entanglement and methods for its measurement.

Main Methods:

Modeling an open quantum system with cavity loss and spontaneous emission.
Analyzing system behavior under weak driving fields.
Calculating normalized cross-correlation functions.

Main Results:

The system achieves a steady pure state under weak driving.

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An optimal atom-field coupling strength maximizes entanglement.

Cavity-enhanced spontaneous emission influences entanglement at higher coupling.

Normalized cross-correlation functions, specifically intensity-field correlations, indicate entanglement.

Conclusions:

Steady-state entanglement in driven optical cavities is achievable and controllable.
Optimizing atom-field coupling is key to maximizing entanglement.
Cross-correlation functions provide a viable method for measuring quantum entanglement in such systems.