Chip-Based Measurement-Device-Independent Quantum Key Distribution

Modern communication strives towards provably secure systems which can bewidely deployed. Quantum key distribution provides a methodology to verify the integrityand security of a key exchange based on physical laws. However, physical systems oftenfall short of theoretical models meaning they can be compromised through uncharacterisedside-channels. The complexity of detection means that the measurement system is a vulnerabletarget for an adversary. Here we present secure key exchange up to200km while removingall side-channels from the measurement system. We use mass-manufacturable, monolithicallyintegrated transmitters that represent an accessible, quantum-ready communication platform.This work demonstrates a network topology that allows secure equipment sharing which isaccessible with a cost-effective transmitter, significantly reducing the barrier for widespreaduptake of quantum-secured communication.