Single-photon advantage in quantum cryptography beyond QKD.

ABSTRACT: Quantum key distribution (QKD) can be used to establish a secret key between trusted parties. Many practical use-cases in communication networks, however, involve parties who do not trust each other. A fundamental cryptographic building block for such distrustful scenarios is quantum coin flipping, which has been investigated only in few experimental studies to date, all of which used probabilistic quantum light sources imposing fundamental limitations. Here, we experimentally implement a quantum strong coin flipping protocol using single-photon states and demonstrate a quantum advantage compared to both classical realizations and implementations using faint laser pulses. We achieve this by employing a state-of-the-art deterministic quantum dot light source in combination with fast, random

SUBMITTER: Vajner DA 

PROVIDER: S-EPMC12949056 | biostudies-literature | 2026 Feb

REPOSITORIES: biostudies-literature