Optical quantum communication theory

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Communication is one of the key technologies of modern society. As we turn more and more to electronic communication, questions such as confidentiality of the information exchange and trust in origin of messages come  to the foreground. Today our communication networks are protected by cryptographic methods that seem to be very powerful. However, they depend on assumptions that have to be checked again and again over time. Our research aims at changing this picture.Quantum mechanics offers some features that are unknown in the classical world: in general, it is not possible to copy quantum signals. Moreover, any attempt to access the content of a quantum message will in general change the message, thereby leaving traces in the system. Thanks to this property, quantum mechanics offers solutions to some problems of our communication society where the asserted properties can be rigorously proven. Unconditional secure communication is one such example.Our work aims at transforming more of the known abstract quantum communication solutions to solutions that can be practically implemented, thus bringing it closer to commercial applications.