According to a paper published in Physical Review Letters, researchers from the University of Science and Technology of China and others have achieved experimental verification of side-channel independent quantum key distribution (QKD) for the first time . Based on the fundamental principles of quantum mechanics, QKD can theoretically provide unconditionally secure key exchange for remote users. However, there is a large gap between experimental realization and theory. In the actual QKD system, since the real device is not perfect, the eavesdropper can use the side channel outside the coding dimension, such as the photon spectrum, emission time, propagation direction, space angular momentum, etc., to steal the key, which leaves the real QKD system. potential security vulnerabilities.
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