Erlangen 2018 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 47: Quantum Information (Quantum Repeater)

Q 47.7: Talk

Wednesday, March 7, 2018, 15:45–16:00, K 1.020

Device-independent Secret Key Rate Analysis for Quantum Repeaters — •Timo Holz, Hermann Kampermann, and Dagmar Bruß — Heinrich-Heine University, Duesseldorf, Germany

The device-independent approach to quantum key distribution (QKD) aims to establish a secret key between two or more parties with untrusted devices, potentially under full control of a quantum adversary. The performance of a QKD protocol can be quantified by the secret key rate, which is linked to the violation of an appropriate Bell-inequality in a setup with untrusted devices. We study secret key rates in the device-independent scenario for different quantum repeater setups and compare them to their device-dependent analogon. The quantum repeater setups under consideration are the original protocol by Briegel et al. and the hybrid quantum repeater protocol by van Loock et al.. The secret key rate depends on a variety of parameters, such as the gate quality or the detector efficiency. We systematically analyze the impact of these parameters and suggest optimized strategies.

[1] T. Holz, H. Kampermann, and D. Bruß, arXiv:1711.06072 (2017)