– Researchers Set New Distance Record With Quantum Keys

The 100-kilometer fiber optic cable through which a team of researchers at DTU has successfully distributed a quantum-encrypted key securely. Credit: DTU

But to succeed, researchers must overcome one of the challenges of quantum mechanics – ensuring consistency over longer distances. Continuous Variable Quantum Key Distribution has so far worked best over short distances. The research group: Adnan A.E. Hajomer, Nitin Jain, Ulrik L. Andersen Ivan Derkach, Hou-Man Chin, Tobias Gehring. Credit: DTU

“The advantage of using this technology is that we can build a system that resembles what optical communication already relies on.” “But CV QKD technology works best over shorter distances. Our task is to increase the distance. And the 100 kilometers is a big step in the right direction.”The researchers succeeded in increasing the distance by addressing three factors that limit their system in exchanging the quantum-encrypted keys over longer distances:

“In our upcoming work, we will use the technology to establish a secure communication network between Danish ministries to secure their communication. We will also attempt to generate secret keys between, for example, Copenhagen and Odense to enable companies with branches in both cities to establish quantum-safe communication,” Tobias Gehring says.

Source: Tech Daily Report (techdailyreport.net)

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