Quantum Tech Could Combat Data Theft NaturePhotonics UNIGEnews nanowires
Using these sensors, scientists were able to generate a secret key at a rate of 64 megabits per second over 10 km of fibre optic cable. Credit: M. Perrenoud - G. Resta / UNIGE
Quantum key distribution is an innovative approach to information security that takes advantage of the principles of quantum mechanics to enable the secure exchange of cryptographic keys over long distances. However, QKD offers a potential solution to this problem. Using QKD in combination with the one-time pad, private communication can be secured even in the face of future advancements in quantum computing technology.
However, despite these advancements, the speed of single-photon detectors used to receive information remains a major limitation for the widespread application of QKD. These detectors must recover for approximately 30 nanoseconds after each detection, which severely limits the throughput of secret keys to about 10 megabits per second.
The SNSPD was optimized for performance and designed to achieve high SKRs. To test their system, the researchers implemented a simplified BB84 protocol with time-bin encoding and one decoy state, with a clock speed of 2.5 GHz. Future Perspective The integration of fourteen nanowires into the detector has resulted in a significant increase in detection rates. In addition, the use of shorter nanowires has also decreased their recovery time.
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