Mainz 2017 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 17: Quantum Repeater and Quantum Communication

Q 17.1: Talk

Tuesday, March 7, 2017, 11:00–11:15, P 3

Device-Independent Secret Key Rates for Quantum Repeater Setups — •Timo Holz, Hermann Kampermann, and Dagmar Bruss — Institut für Theoretische Physik III, Heinrich-Heine-Universität Düsseldorf, Universitätsstraße 1, D-40225 Düsseldorf, Germany

The device-independent approach to quantum key distribution (QKD) aims to distribute a secret key between two or more parties with untrusted devices, possibly under full control of a quantum adversary. The performance of a QKD-protocol can be quantified by the secret key rate R, which can be lower-bounded via the violation of an appropriate Bell-inequality. We study secret key rates in the device-independent bipartite case for different quantum repeater setups and compare them to their device-dependent analogon [1]. The quantum repeater setups under consideration are the original protocol by Briegel et al. [2] and the hybrid quantum repeater protocol by van Loock et al. [3]. For a given repeater scheme and a given QKD-protocol, the secret key rate depends on a variety of parameters, such as the gate quality or the fidelity of initially distributed states. We investigate the impact of these parameters and suggest optimized strategies.

[1] S. Abruzzo et al., Phys. Rev. A 87, 052315 (2013)

[2] H. J. Briegel et al., Phys. Rev. Lett. 81, 5932 (1998)

[3] P. van Loock et al., Phys. Rev. Lett. 96, 240501 (2006)