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International Team Achieves Breakthrough in Quantum Key Distribution

4/18/2026

Summary

Story summary

An international team from Germany and China demonstrated a stable quantum key distribution system using time-bin encoding with semiconductor quantum dots.
They transmitted signals over 120 kilometers of optical fiber for more than six hours, achieving a secure key rate of about 15 bits per second.
The study was published in Light: Science & Applications and funded by various German research initiatives, highlighting practicality for scalable, quantum-secure networks.

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Story summary

An international team from Germany and China demonstrated a stable quantum key distribution system using time-bin encoding with semiconductor quantum dots.
They transmitted signals over 120 kilometers of optical fiber for more than six hours, achieving a secure key rate of about 15 bits per second.
The study was published in Light: Science & Applications and funded by various German research initiatives, highlighting practicality for scalable, quantum-secure networks.