Researchers from Nanjing University of Posts and Telecommunications have demonstrated secure measurement-device-independent quantum key distribution (MDI-QKD) transmission across 170 kilometers (106 miles).
The protocol uses photons with three characterized quantum states to encode data, which delivers immunity to attacks targeting detection devices that measure the quantum properties of individual photons.
The researchers utilized a state-of-the-art experimental installation for encoding and detection and showed that this approach can transmit keys over longer distances and at higher rates than similar MDI-QKD protocols. Theoretical calculations indicated secure transmission could be possible over distances of up to 200 kilometers (124 miles).
From The Optical Society
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