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Related Experiment Video

Updated: Jul 15, 2026

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit

Published on: September 8, 2023

Functional quantum nodes for entanglement distribution over scalable quantum networks.

Chin-Wen Chou¹, Julien Laurat, Hui Deng

¹Norman Bridge Laboratory of Physics 12-33, California Institute of Technology, Pasadena, CA 91125, USA.

Science (New York, N.Y.)

|April 7, 2007

Summary

Researchers distributed quantum entanglement between two quantum nodes 3 meters apart, paving the way for secure quantum communication and quantum repeaters.

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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

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Published on: August 2, 2019

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Last Updated: Jul 15, 2026

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit

Published on: September 8, 2023

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

Area of Science:

Quantum Information Science
Quantum Communication
Quantum Optics

Background:

Quantum entanglement is a fundamental resource for quantum information processing.
Distributing entanglement over significant distances is crucial for building quantum networks.
Previous experiments have faced challenges in maintaining entanglement fidelity and scalability.

Purpose of the Study:

To demonstrate entanglement distribution between two physically separated quantum nodes.
To verify the quality of entanglement using Bell inequality measurements.
To show the potential of the developed system for quantum communication protocols and quantum repeaters.

Main Methods:

Asynchronous preparation of two pairs of atomic memories.
Coherent mapping of stored atomic states into light fields.
Measurement of Bell inequality violation to confirm entanglement.

Main Results:

Successful distribution of entanglement between quantum nodes separated by 3 meters.
Achieved near-maximum polarization entanglement.
Demonstrated violation of a Bell inequality, confirming genuine entanglement.

Conclusions:

The demonstrated system successfully distributes quantum entanglement over a short distance.
The developed quantum nodes and channels are suitable building blocks for quantum repeaters.
This work advances the development of robust long-distance quantum communication.