Simple and efficient quantum key distribution with parametric down-conversion

Abstract

We propose an efficient quantum key distribution protocol based on the photon-pair generation from parametric down-conversion (PDC). It uses the same experimental setup as the conventional protocol, but a refined data analysis enables detection of photon-number splitting attacks by utilizing information from a built-in decoy state. Assuming the use of practical detectors, we analyze the unconditional security of the new scheme and show that it improves the secure key generation rate by several orders of magnitude at long distances, using a high intensity PDC source.

5 pages, 2 figures; published version in Phys. Rev. Lett

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Cited by in corpus (5)

• Quantum key distribution with entangled photon sources
• General theory of decoy-state quantum cryptography with source errors
• Quantum key distribution with triggering parametric down conversion sources
• Recent developments in quantum key distribution: theory and practice
• Quantum cryptography: theory and practice