Generalized approach to Gaussian and non-Gaussian CV QKD

Abstract

Quantum key distribution (QKD) is a growing phenomenon rapidly being adopted around the world because it adds unconditional security to our day to day communication. Recent trend in QKD has shifted towards using continuous variables (CV) to encode quantum data because of the ease in producing, manipulating, transmitting and measuring these signals. In this thesis we have developed the foundation of CV QKD with a generalized approach. By generalizing steps involved in CV QKD protocols, we have simulated several Gaussian as well as non-Gaussian protocols enabling us to quickly explore improvement opportunities in any CV QKD protocol. Resultingly we were able to find significant improvement in measurement device independent (MDI) protocol. Our method allows the generation of a positive key rate when initial squeezing is low, additionally these states offer more tolerance to thermal noise. Such states bring MDI protocol closer to commercial realization.