Paulo Mateus

Device-independence (DI) is the golden standard for quantum key distribution (QKD) security: it allows unconditional security based on the laws of physics even for untrusted or maliciously designed devices. Nevertheless, DI-QKD, for now, remains extremely challenging. The first proof-of-principle experiments having been performed only very recently, almost 40 years after the invention of BB84. It then becomes naturally interesting to study scenarios which may reach a compromise between experimental challenge and security: for example, by assuming than the users have a partial description of the devices. This intermediate scenario is called semi-device-independent (SDI) QKD and aims for a reasonable trade-off between the highest level of security, device-independence, and experimental feasibility.