Device-independent secret-key-rate analysis for quantum repeaters

Abstract

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 can be lower bounded via 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.. 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 detector efficiency. We systematically analyze the impact of these parameters and suggest optimized strategies.

15 pages, 12 figures

References in corpus (7)

• Device-independent security of quantum cryptography against collective attacks
• General Benchmarks for Quantum Repeaters
• Fundamental Limits of Repeaterless Quantum Communications
• Quantum Eavesdropping without Interception: An Attack Exploiting the Dead Time of Single Photon Detectors
• Hybrid quantum repeater based on dispersive CQED interactions between matter qubits and bright coherent light
• Security proof for QKD systems with threshold detectors
• Rate analysis for a hybrid quantum repeater

Cited by in corpus (2)

• Advances in Quantum Cryptography
• Entropy bounds for multiparty device-independent cryptography