Everybody is welcome to the lecture of Serge Fehr (Cryptology)

Abstract: We introduce and discuss a new quantum game, which captures the monogamy of entanglement, and we analyze its behavior under parallel repetition. An easy application of our result is that standard BB84 QKD remains secure even if Bob's measurement device is arbitrarily malicious. Another application (which I will probably not discuss) is to position-based crypto, where it follows that the parallel repetition of the standard BB84-based position-verification scheme is secure against an adversary with linearly bounded entanglement. This is joint work with M. Tomamichel, J. Kaniewski, and S. Wehner (CQT)