Final answer:
Quantum Key Distribution exploits quantum entanglement to establish secure communication, where the state of entangled particles is used to detect eavesdropping.
Step-by-step explanation:
Quantum Key Distribution (QKD) is exploiting quantum entanglement which is one of the fascinating phenomena of quantum mechanics. Unlike quantum tunneling, which involves particles penetrating through a potential energy barrier as described in the provided information quantum entanglement is a different principle used in QKD. This principle allows two or more particles to be in such a state that the measurement of certain properties of one particle instantly determines the properties of the other(s), regardless of the distance separating them.
This entangled relationship is used in QKD to detect any eavesdropping attempt, as the act of measuring the quantum state of the particles would change their state and reveal the presence of an interloper to the legitimate parties involved.