Quantum Internet Applications

In this talk, we will discuss the application layer of a quantum internet. In such a network, the nodes are connected by quantum communication links, and can altogether be in an arbitrary entangled state. This allows the network to run a wide range of application, much beyond quantum key distribution, the main application of current quantum communication networks.
We will first review the roadmap to develop such a network, and present the efforts to identify, classify and develop applications that could be implemented while the capabilities of the network are improving.
We will then focus on two specific application domains. The first ones are on authentication mechanisms. It is well known that quantum key distribution requires authenticated classical channels in order to avoid basic attacks from eavesdropper. We will show that the common solution adopted by quantum key distribution systems becomes impractical when the complexity of networks increases. We will then review alternative solutions, and discuss their security.
The second type of applications is for multiparty computation. In this setting, some parties want to compute a distributed function of distributed inputs while revealing as little information as possible. This problem is impossible to solve in full generality, even using quantum ressources. There are, however, several restricted settings which admit solutions. We will review some of these settings, and the main techniques used to make the protocols secure.