Valentina Marulanda Acosta

Quantum key distribution allows two parties to share a secret key that can be subsequently used to encrypt their data transfer. QKD employs the particularities of quantum mechanics in order to obtain security levels not achievable by using purely classical means. Continuous variable QKD has the advantage of encoding the key bits into the quadratures of a field instead of using the polarization of single photons which makes it possible to implement it with the aid of already existing transmitter/receiver telecom technologies. However, the distances covered by terrestrial QKD links is limited by the attenuation of optical fiber. Classical repeaters cannot be used and quantum repeaters are complex devices which is why a satellite relay can be an apealing solution for intercontinental links. Atmospheric turbulence can degrade the propagating signal which is why correction through adaptive optics is going to be considered.