A quantum communication technique can also measure minute vibrations in the ground, making it potentially useful for detecting earthquakes and landslides
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. uses certain properties of photons – particles of light – to encrypt data sent between two devices, making the system more secure than traditional encryption. If an eavesdropper tries to access the encrypted data, the photons’ quantum state is changed, which can be detected and the sender can choose to stop the transmission.
“For the first time, we showed that a twin-field QKD system can both distribute quantum keys and sense vibrations over ultra-long distances, which is a new mechanism as far as we know,” says Pan. The rate of data transfer needs to be improved before the technology can be built into a large-scale quantum communication network. But if that happens in the future, vibration sensing could be a useful by-product of such a system, saysOne impressive aspect of the vibration sensing is how accurately the researchers can pinpoint it on the length of the cable, he adds.
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