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

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Hybrid long-distance entanglement distribution protocol.

J B Brask¹, I Rigas, E S Polzik

¹QUANTOP, The Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen Ø, Denmark.

Physical Review Letters

|January 15, 2011

Summary

We introduce a hybrid quantum repeater protocol for distributing entanglement over long distances. This method uses homodyne detection to create entangled states, enabling near-deterministic entanglement swapping with linear optics.

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Area of Science:

Quantum Information Science
Quantum Communication
Quantum Optics

Background:

Long-distance quantum communication relies on quantum repeaters to overcome signal loss.
Entanglement distribution is crucial for quantum networks and secure communication.
Existing quantum repeater protocols face challenges in efficiency and scalability.

Purpose of the Study:

To propose a novel hybrid quantum repeater protocol.
To enable efficient long-distance distribution of entanglement.
To utilize continuous-discrete variable entanglement for quantum repeaters.

Main Methods:

Development of a hybrid (continuous-discrete variable) quantum repeater protocol.
Generation of entangled coherent state superpositions via homodyne detection.
Entanglement swapping using linear optics and homodyne detectors.

Main Results:

Demonstration of near-deterministic entanglement swapping with entangled coherent states.
Evaluation of the protocol's performance using combined linear optical elements and homodyne detection.
Successful generation of entangled states from single-photon detection outputs.

Conclusions:

The proposed hybrid quantum repeater protocol offers a promising approach for long-distance entanglement distribution.
The protocol leverages readily available components like linear optics and homodyne detectors.
This work contributes to the advancement of quantum communication technologies.