Device-independent quantum cryptography in the multipartite scenario

Zapraszamy w środę 03.06.2020 o godz. 14:00 na seminarium.

Seminarium ONLINE pod tytułem: "Device-independent quantum cryptography in the multipartite scenario" poprowadzi Gláucia Murta, Heinrich-Heine-Universitat Dusseldorf

Abstract: Going beyond the simple two-party scenario of quantum key distribution, we consider N parties who wish to certify security against a potential eavesdropper in a cryptographic task. Moreover, we consider the very adversarial scenario in which the parties make no assumption about the underlying quantum system or the internal working of their measurement devices. This is the device-independent scenario. In the device-independent scenario, security is certified by the violation of a Bell inequality. In this talk I will present our recent results on bounds on Eve's uncertainty as a function of the violation of the multipartite MABK Bell inequality. I will discuss the implication of these results to cryptographic tasks, such as randomness expansion and conference key agreement. Finally, I discuss the challenges and possibilities to extend our results to other Bell inequalities, which can lead to better cryptographic protocols.