The new record for quantum key distribution is over a 1000 km distance.

In China, researchers made a breakthrough in quantum communication. The system shared a quantum key over a 1000 km distance. "A point-to-point long-distance quantum key distribution (QKD) over a distance of 1,002 km has been achieved by scientists from the University of Science and Technology of China (USTC) of the Chinese Academy of Sciences (CAS), and their collaborators from Tsinghua University, Jinan Institute of Quantum Technology, and Shanghai Institute of Microsystem and Information Technology (SIMIT), CAS.". (ScitechDaily.com/Secure Communication Breakthrough: 1,000+ km Quantum Key Distribution Achieved)

That kind of thing allows ultra-secure communication over long distances. The ultra-secure communication is needed in things like the military. And especially in nuclear weapon security. But also things like cryptocurrencies require ultra-secure communication.

But the reason why people are researching quantum cryptology is that. The communication devices use encrypted data also for other reasons. Then make sure that confidential information will not leak or that some hacker will create fake cryptocurrencies.

Encryption is urgent in communication between devices. Because it filters the errors and guarantees that the only device where the information is meant can open the data. That thing filters unnecessary electromagnetic voices from communication. And the system has better voice quality. This is another reason why people use BlueTooth in many wireless digital systems.

"Researchers from several Chinese institutions have set a new world record by achieving a non-relay quantum key distribution over 1,002 km. This advancement, utilizing twin-field QKD, ultra-low-loss fiber, and ultra-low-noise superconducting single-photon detectors, signifies a major step towards high-speed intercity quantum communication networks". (ScitechDaily.com/Secure Communication Breakthrough: 1,000+ km Quantum Key Distribution Achieved)

The encryption guarantees that the system knows what data is meant for it. And that kind of information is necessary also in drone control. The ability to control individual drones in the thousand individual swarms requires that the drone can detect and separate the commands that are meant for it from white noise. White noise means radio waves that don't mean anything or even disturb the necessary communication. The communication that is meant for some other device is meaningless.

Long-distance communication in quantum systems makes it possible to exchange information between long-distance devices secured. The eavesdroppers cannot open the qubit without the receiving system noticing that thing.

Disturbing quantum communication is not a very easy thing, because the system must point data from the information flow. And then try to affect the qubit. The thing with the qubit is that if somebody tries to capture it the data that the qubit transports is lost. And missing qubits uncover that somebody attacks the system.

Disturbing is far easier than capturing and opening messages. That is sent between two devices. If the target of this type of attack notices something that target can change the algorithm or tactics. If the target notices that somebody reads messages that removes the benefit of the hacking.

https://scitechdaily.com/secure-communication-breakthrough-1000-km-quantum-key-distribution-achieved/

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