Intensity Modulation/Direct Detection Optical Key Distribution (IM/DD OKD)

Explore the principles and applications of intensity modulation/direct detection optical key distribution (IM/DD OKD) in this comprehensive 58-minute lecture by Prof. Konrad Banaszek from the Centre for Quantum Optical Technologies and Faculty of Physics, University of Warsaw, Poland. Delve into the technique's ability to generate secure cryptographic keys over optical communication links, protected against passive eavesdropping by leveraging inherent shot noise in photodetection. Examine the physical principles underlying IM/DD OKD, witness a proof-of-principle demonstration, and analyze estimates for achievable key rates in space-to-ground communication scenarios. Gain insights into how this method ensures key security even when eavesdroppers capture a larger fraction of the signal than legitimate recipients.