Quantum key distribution: communication through a quantum-encrypted channel.
Sebastian de Bone (QuTech, TU Delft) and Julius de Hond (Massachusetts Institute of Technology) created a website to give students and the general public an idea of how quantum key distribution works, and what it would be like to communicate through a quantum-encrypted channel. As an end user, you don't notice much, of course!
To pique visitors' curiosity, they visualized the photon exchange and selection process, before establishing
a "quantum secure" channel through which they can exchange chat messages with each other.
By embedding a fundamental quantum communication concept in an everyday setting, they hope to get
students to ask questions about this near-term quantum technology.