QKD receiver chip (IMAGE) Optica Caption The silica-based QKD receiver shown consists of a photonic integrated circuit and two external single-photon detectors. Credit Simone Atzeni, CNR-IFN Usage Restrictions None License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.