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Related Experiment Video

Updated: Apr 27, 2026

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

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

Published on: September 5, 2019

Time-bin entangled photons from a quantum dot.

Harishankar Jayakumar¹, Ana Predojević¹, Thomas Kauten¹

¹Institut für Experimentalphysik, Universität Innsbruck, Technikerstr. 25, 6020 Innsbruck, Austria.

Nature Communications

|June 27, 2014

Summary

This summary is machine-generated.

Researchers developed a new source for entangled photon pairs, crucial for long-distance quantum communication over fiber optic networks. This breakthrough utilizes quantum dots to generate robust pairs for secure information transfer.

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Last Updated: Apr 27, 2026

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Area of Science:

Quantum information science
Quantum communication
Solid-state physics

Background:

Long-distance quantum communication is a key goal, leveraging quantum states of photons.
Existing fiber optic networks offer a viable transport medium.
A reliable source of entangled single-photon pairs is essential for this technology.

Purpose of the Study:

To realize a source of time-bin entangled photon pairs.
To utilize the biexciton-exciton cascade in III/V self-assembled quantum dots.
To enable robust quantum communication protocols.

Main Methods:

Employing the biexciton-exciton cascade in a quantum dot.
Utilizing inherently phase-stable interferometry for photon pair analysis.
Performing quantum state tomography to confirm entanglement.

Main Results:

Successfully generated time-bin entangled photon pairs from a single quantum emitter.
Achieved a fidelity of 0.69(3) for the entangled photon pairs.
Obtained a concurrence of 0.41(6), confirming time-energy entanglement.

Conclusions:

The developed quantum dot source is a promising candidate for future quantum communication systems.
The results demonstrate the feasibility of generating high-quality entangled photons for quantum networks.
This work advances the development of practical quantum communication technologies.