Quantum cryptography today uses optical fiber over several hundred kilometers and is marked by its high degree of security: it is impossible to copy or intercept information without making it disappear.
However, the fact that it is impossible to copy the signal also prevents scientists from amplifying it to diffuse it over long distances, as is the case with the Wi-Fi network.
Since the signal cannot be copied or amplified without it disappearing, scientists are currently working on how to make quantum memories capable of repeating it by capturing the photons and synchronizing them, so they can be diffused further and further. All that remains is to find the right material for making these quantum memories. “The difficulty is finding a material capable of isolating the quantum information conveyed by the photons from environmental disturbances so that we can hold on to them for a second or so and synchronize them”.
Researchers at the University of Geneva (UNIGE), Switzerland, in partnership with CNRS, France, have discovered a new material in which an element, ytterbium, can store and protect the fragile quantum information even while operating at high frequencies. (1)
Message that will be lost.
Inside the whirling wind…
The great mountain is looking.
Listening to all the messages.
Passing through the forest trees.
It knows that it will be here tomorrow.
But it will not convey the message.
Because that was never the goal.
The message was not to be conveyed.
Only the silence was.
Before and after the message…
Can you listen to the wind?