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Satellite-based entanglement distribution over 1200 kilometers.

Juan Yin^1,2, Yuan Cao^1,2, Yu-Huai Li^1,2

¹Department of Modern Physics and Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China.

Science (New York, N.Y.)

|June 17, 2017

Summary

This summary is machine-generated.

Satellite-based quantum networks achieved long-distance entanglement distribution over 1203 km, overcoming previous distance limitations. This breakthrough enables foundational quantum physics tests and scalable quantum networks.

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Area of Science:

Quantum physics
Quantum communication networks

Background:

Long-distance entanglement distribution is crucial for quantum physics tests and quantum networks.
Previous distance limitations (~100 km) were primarily due to channel loss.

Purpose of the Study:

To demonstrate satellite-based distribution of entangled photon pairs over unprecedented distances.
To overcome the limitations of terrestrial fiber-based entanglement distribution.

Main Methods:

Utilized a satellite platform for distributing entangled photon pairs.
Employed two satellite-to-ground downlinks with varying lengths (1600-2400 km).
Ensured strict Einstein locality conditions for measurements.

Main Results:

Successfully distributed entangled photon pairs over 1203 km between two ground locations.
Confirmed the survival of two-photon entanglement.
Observed a violation of Bell inequality (2.37 ± 0.09), confirming quantum correlations.
Achieved significantly higher effective link efficiency compared to direct fiber transmission.

Conclusions:

Satellite-based distribution is a viable method for long-distance quantum entanglement.
This technology overcomes previous distance limitations, paving the way for global quantum networks.
The results support foundational tests of quantum mechanics over large distances.