Key rates for quantum key distribution protocols with asymmetric noise

Abstract

We consider the asymptotic key rates achieved in the simplest quantum key distribution protocols, namely the BB84 and the six-state protocols, when non-uniform noise is present in the system. We first observe that higher qubit error rates do not necessarily imply lower key rates. Secondly, we consider protocols with advantage distillation and show that it can be advantageous to use the basis with higher quantum bit error rate for the key generation. We then discuss the relation between advantage distillation and entanglement distillation protocols. We show that applying advantage distillation to a string of bits formed by the outcomes of measurements in the basis with higher quantum bit error rate is closely connected to the two-to-one entanglement distillation protocol DEJMPS. Finally, we discuss the implications of these results for implementations of quantum key distribution.

arXiv comment11 pages, 7 figures. Typos corrected and references added. Close to the published version

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Cited by in corpus (5)

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• Comparison of Discrete Variable and Continuous Variable Quantum Key Distribution Protocols with Phase Noise in the Thermal-Loss Channel
• Improving the performance of twin-field quantum key distribution with advantage distillation technology
• Enhancing Quantum Key Distribution with Entanglement Distillation and Classical Advantage Distillation