Long-distance quantum key distribution with imperfect devices

Abstract

Quantum key distribution over probabilistic quantum repeaters is addressed. We compare, under practical assumptions, two such schemes in terms of their secure key generation rates per quantum memory. The two schemes under investigation are the one proposed by Duan et al. in [Nat. 414, 413 (2001)] and that of Sangouard et al. in [Phys. Rev. A 76, 050301 (2007)]. We consider various sources of imperfection in both protocols, such as nonzero double-photon probabilities at the sources, dark counts in detectors, and inefficiencies in the channel, photodetectors and memories. We also consider memory decay and dephasing processes in our analysis. For the latter system, we determine the maximum value of the double-photon probability beyond which secretkey distillation is not possible. We also find the crossover distance beyond which the repeater schemes outperform the non-repeater ones. We finally compare the two protocols in terms of their achievable secret key generation rates at their optimal settings

28 pages, 12 figures

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Cited by in corpus (11)

• Advances in Quantum Cryptography
• Memory-assisted measurement-device-independent quantum key distribution
• Photonic Quantum Networks formed from NV- Centers
• Memory-Assisted Quantum Key Distribution with a Single Nitrogen Vacancy Center
• Repeat-until-success quantum repeaters
• Measurement-device-independent quantum key distribution with ensemble-based memories
• Quantum key distribution over quantum repeaters with encoding: Using Error Detection as an Effective Post-Selection Tool
• Multi-party quantum summation based on quantum teleportation
• Simple efficient decoders for quantum key distribution over quantum repeaters with encoding
• Quantum repeaters with encoding on nitrogen-vacancy center platforms
• Diagrammatic technique for simulation of large-scale quantum repeater networks with dissipating quantum memories