A model for optimizing quantum key distribution with continuous-wave pumped entangled-photon sources

• URL: http://arxiv.org/abs/2103.14639v3
• Date: Thu, 22 Jul 2021 08:59:52 GMT
• Title: A model for optimizing quantum key distribution with continuous-wave pumped entangled-photon sources
• Authors: Sebastian Philipp Neumann, Thomas Scheidl, Mirela Selimovic, Matej Pivoluska, Bo Liu, Martin Bohmann and Rupert Ursin
• Abstract summary: Quantum Key Distribution (QKD) allows unconditionally secure communication based on the laws of quantum mechanics. We analyze the underlying mechanisms for QKD with temporally uniform pair-creation probabilities. We develop a model to calculate optimal trade-offs for maximal secure key rates.
• Score: 3.0178691659863452
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum Key Distribution (QKD) allows unconditionally secure communication based on the laws of quantum mechanics rather then assumptions about computational hardness. Optimizing the operation parameters of a given QKD implementation is indispensable in order to achieve high secure key rates. So far, there exists no model that accurately describes entanglement-based QKD with continuous-wave pump lasers. For the first time, we analyze the underlying mechanisms for QKD with temporally uniform pair-creation probabilities and develop a simple but accurate model to calculate optimal trade-offs for maximal secure key rates. In particular, we find an optimization strategy of the source brightness for given losses and detection-time resolution. All experimental parameters utilized by the model can be inferred directly in standard QKD implementations, and no additional assessment of device performance is required. Comparison with experimental data shows the validity of our model. Our results yield a tool to determine optimal operation parameters for already existing QKD systems, to plan a full QKD implementation from scratch, and to determine fundamental key rate and distance limits of given connections.

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