Which quantum phenomenon is specifically leveraged by QKD (Quantum Key Distribution) systems being adopted by major retailers for secure payment processing?

As science advances, quantum computing threatens traditional retail cybersecurity systems. Quantum cryptography represents the cutting edge of data protection science for retailers handling sensitive consumer information. This poll tests your knowledge about how this revolutionary technology is being implemented to safeguard retail transactions and customer data in an increasingly vulnerable digital marketplace.

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Quantum entanglement, where measurement of one particle instantly affects its paired particle regardless of distance
Quantum tunneling, allowing data packets to bypass conventional network security barriers
Quantum superposition, enabling encryption keys to exist in multiple states simultaneously
Quantum decoherence, automatically destroying data when unauthorized access is detected