Rostock 2019 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 41: Poster: Quantum Optics and Photonics II

Q 41.7: Poster

Wednesday, March 13, 2019, 16:15–18:15, S Fobau Physik

Device-independent secret key rate from optimized Bell inequality violation — •Sarnava Datta, Hermann Kampermann, and Dagmar Bruß — Institut für Theoretische Physik III, Heinrich-Heine-Universität Düsseldorf, Universitätstraße 1, D-40225, Düsseldorf, Germany

Quantum Key distribution (QKD) is well established and starts to enter the commercial market. However, due to the deviation between theoretical models and practical devices, the security of such systems cannot be ensured. We consider the device-independent (DI) scenario where the security is not based on any assumptions about the intrinsic properties of the devices and the quantum signals. Rather it is based on the loophole-free violation of a Bell inequality. We introduce a Device-Independent Quantum Key Distribution (DIQKD) scenario in which a Bell inequality will be constructed from the performed measurement data. Given the observed data of a DIQKD protocol involving n parties, m measurement settings per party and k outcomes per measurement, our goal is to find an optimal general (n,m,k) Bell inequality to maximize the achievable DI secret key rate [1].

References: [1] L. Masanes, S. Pironio, and A. Acín , Nat. Commun. 2, 238 (2011)