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Related Experiment Video

Updated: Jun 23, 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

Towards long-distance atom-photon entanglement.

W Rosenfeld¹, F Hocke, F Henkel

¹Fakultät für Physik, Ludwig-Maximilians-Universität München, D-80799 München, Germany.

Physical Review Letters

|May 14, 2009

Summary

Researchers achieved entanglement between a remote atom and photon. This quantum networking breakthrough demonstrates atom dephasing on a 150-microsecond timescale, crucial for future quantum networks.

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

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Area of Science:

Quantum physics
Atomic physics
Quantum information science

Background:

Entanglement is a key quantum phenomenon enabling advanced technologies.
Maintaining entanglement over distance is critical for quantum communication and networking.

Purpose of the Study:

To demonstrate and verify entanglement between a single trapped atom and a single photon at remote locations.
To investigate the coherence and dephasing dynamics of the entangled atom-photon system.

Main Methods:

Utilized a single trapped atom and a single photon.
Transmitted the photon over a 300 m optical fiber to a spatially separated receiver.
Performed local correlation measurements to verify entanglement.
Measured the temporal evolution of the atomic density matrix after photon-induced state projection.

Main Results:

Successfully observed entanglement between the atom and photon at remote locations.
Verified the degree of coherence using local correlation measurements.
Measured the dephasing time scale of the single atom to be 150 microseconds.

Conclusions:

The observed entanglement and measured dephasing time are significant steps towards realizing long-distance quantum networking.
This work paves the way for robust quantum communication protocols using individual neutral atoms.