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Mobile Networks and Applications

A Quantum Key Distribution Protocol Based on the EPR Pairs and its Simulation

Jian Li, Hengji Li, Na Wang, Chaoyang Li, Yanyan Hou, Xiu‐Bo Chen, Yu‐Guang Yang

Published Nov 11, 2019• 9 citations
Publisher
DOI
10.1007/s11036-019-01408-2

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Quantum key distribution (QKD) is used in quantum cryptographic systems to exchange secret key between parties who need to communicate secretly. According to the structure of European Secoqc QKD network, a QKD protocol is proposed. Entanglement swapping between Einstein-Podolsky-Rosen (EPR) pairs can be used to exchange message bits in two remote places. Based on this idea, n + 1 EPR pairs are used as logical quantum channel (for n nodes per routing), while measurements of Bell operator are transmitted by classical channel. Random space quantum channel selection is exploited in our protocol to improve the probability of revealing Eve. Compared with traditional EPR protocol, the proposed protocol exhibits many features, which are minutely described.
A novel secure quantum key distribution scheme using EPR pairs is presented. It has three distinct features: 1) it is very efficient. Unlike existing quantum key distribution schemes, this scheme uses all EPR pairs in distributing the key except those chosen for checking eavesdroppers; 2) this protocol has high capacity because each EPR pair carries 2 bits of key code while existing schemes carry only one bit of key code; 3) this scheme can be used for distributing a common key among arbitrary number of parties.