Which scientific breakthrough has been most successfully implemented in retail payment systems to enhance security against quantum computing threats?

The intersection of scientific innovation and retail has transformed how we pay for products. From the early days of mechanical cash registers to today's biometric authentication and quantum-secured transactions, science has continuously reshaped retail payment systems. This trivia question focuses on a groundbreaking scientific advancement that revolutionized retail payment security in the past decade. Test your knowledge about how cutting-edge science is protecting consumer transactions in the modern retail landscape.

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Post-Quantum Cryptography (PQC)
Blockchain-based Zero-Knowledge Proofs
Neural Cryptographic Authentication
Homomorphic Encryption Protocols