QKD transmitter chip (IMAGE) Optica Caption Researchers have developed a quantum key distribution (QKD) system based on silicon photonics that can transmit secure keys at unprecedented speeds. The QKD transmitter (pictured) combines a photonic and electric integrated circuit with an external diode laser. Credit Rebecka Sax, University of Geneva 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.