Entangled Quantum Key Distribution with a Biased Basis Choice - Quantum PhysicsReport as inadecuate




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Abstract: We investigate a quantum key distribution QKD scheme which utilizes abiased basis choice in order to increase the efficiency of the scheme. Theoptimal bias between the two measurement bases, a more refined error analysis,and finite key size effects are all studied in order to assure the security ofthe final key generated with the system. We then implement the scheme in alocal entangled QKD system that uses polarization entangled photon pairs tosecurely distribute the key. A 50-50 non-polarizing beamsplitter with differentoptical attenuators is used to simulate a variable beamsplitter in order toallow us to study the operation of the system for different biases. Over 6hours of continuous operation with a total bias of 0.9837-0.0163 Z-X, we wereable to generate 0.4567 secure key bits per raw key bit as compared to 0.2550secure key bits per raw key bit for the unbiased case. This represents anincrease in the efficiency of the key generation rate by 79%.



Author: C. Erven, X. Ma, R. Laflamme, G. Weihs

Source: https://arxiv.org/



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