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Japan Achieves Breakthrough in Quantum Entanglement Swapping

11/7/2025

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Summary

Story summary

The National Institute of Information and Communications Technology (NICT) in Japan achieved the world's first entanglement swapping using sum-frequency generation (SFG) between single photons.
The achievement uses low-noise superconducting nanowire detectors to enable high-fidelity entanglement swapping without destroying entangled photon pairs.
The results were published in Nature Communications on October 7, 2025, opening new avenues for secure data transfer and long-distance quantum key distribution.

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Story summary

The National Institute of Information and Communications Technology (NICT) in Japan achieved the world's first entanglement swapping using sum-frequency generation (SFG) between single photons.
The achievement uses low-noise superconducting nanowire detectors to enable high-fidelity entanglement swapping without destroying entangled photon pairs.
The results were published in Nature Communications on October 7, 2025, opening new avenues for secure data transfer and long-distance quantum key distribution.