Analytical Model and Topology Evaluation of Quantum Secure Communication Network

Due to the intrinsic point-to-point feature of quantum key distribution system, it is inevitable to study and develop the Quantum Secure Communication Network (QSCN) technology to provide security communication service for a large-scale of nodes over a large spatial area. Considering the quality assurance and expense control, building an effective analytical model of QSCN becomes a critical task. In this paper, the first analytical model of QSCN is proposed, which is called flow-based QSCN (F-QSCN) analytical model. In addition, based on the F-QSCN analytical model, the research on QSCN topology evaluation is conducted by proposing a unique QSCN performance indicator, named Information-Theoretic Secure communication bound, and the corresponding linear programming based calculation algorithm. Plentiful experimental results based on the topologies of SECOQC network and Tokyo network validate the effectivity of the proposed analytical model and the performance indicator.