Wydarzenia

Seminarium Fizyki Politechniki Wrocławskiej

IM/DD OKD: Intensity modulation/direct detection optical key distribution

prof. dr hab. czł. koresp. PAN Konrad Banaszek

Centre for Quantum Optical Technologies, Wydział Fizyki, Uniwersytet Warszawski

Abstract:

Intensity modulation/direct detection optical key distribution (IM/DD OKD) is a technique to generate a cryptographic key over an optical communication link that is secure against passive eavesdropping. The key security is guaranteed by the shot noise inherent to the photodetection process and can be ensured even when the fraction of the signal captured by an eavesdropper is larger than that received by the legitimate recipient. This talk will review the physical principle of IM/DD OKD, present a proof-of-principle demonstration, and discuss estimates for attainable key rates in space-to-ground communication scenarios.