Quantum key distribution (QKD) is widely considered the most advanced form of quantum cryptography, offering a path toward virtually unbreakable security for the future quantum internet. One promising technology behind these secure systems involves semiconductor quantum dots (SQDs), tiny solid-state light sources capable of generating high-quality single photons for quantum communication. These devices could help boost secure key generation rates while also supporting future quantum repeaters needed for large-scale quantum networks.

Another important development is time-bin encoding, a technique that stores information in the arrival times of photons.…