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Quantum key distribution [1] is one of the most rapidly developing areas in modern science. The most important advantage of QKD is the security of personal data transmission with quantum-distributed keys, based on the laws of quantum physics, rather than mathematical algorithms. The latter can be hacked, but it is impossible to deceive the fundamental laws of physics.
You have probably often caught yourself thinking that many things in our world are arranged as illogically as possible, and, ideally, should have been arranged completely differently. In philosophy, this problem is often referred to as the actual and the proper. And the way out of it in many cases is not to bring the actual to the proper, but to understand why the actual is the way it is.