A group of Chinese researchers managed to set a new world record with an extension of Safe and direct quantum communication (QSDC) that allowed data to be transmitted over a distance of 102.2 km.
The previous record was only 18 km, and although transmission speeds were very poor – barely 0.54 bits per second – this achievement points to a future in which this type of communication can be used in a practical and large-scale way. This is interesting because of a basic section of quantum communication: There is no way to hack it.
slow but very sure
In QSDC, . is used The principle of quantum entanglement It was predicted in 1935 by Einstein, Podolsky, and Rosen. This quantum phenomenon, which has no classical equivalent, indicates that entangled particles have a co-correlation which means that if you change the properties of one when you observe or measure it, the other will change instantly.
This is important because it makes it almost impossible This communication can be hacked. theoretically These particles maintain that bond even if they are light years awayTherefore, these systems must be able to operate over long distances.
This team of researchers has already set the previous record, and their new breakthrough takes advantage of a physical system With a new protocol. The simplest one eliminated the “complex active compensation subsystem” of the previous model, which in turn allowed to reduce the error rate of these connections and make them more noise-resistant.
The result was a connection that reached a distance of 102.2 km. The very low speed makes it impractical in current terms, but for example it goes up if the class is smaller: It was possible to transmit at a speed of 22.4 kbps over a distance of 30 km.
This achievement is a promise of what this type of communication can achieve: if the development of this technology is appropriate, it will not be long before we have Quantum communication is impenetrable.
via | Eurasia Times
More information | EurekAlert
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