J. Phys. Soc. Jpn. 86, 094001 (2017) [9 Pages]
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Notes on a Continuous-Variable Quantum Key Distribution Scheme

Tsubasa Ichikawa, Takuya Hirano, Takuto Matsubara, Motoharu Ono, and Ryo Namiki
+ Affiliations
Department of Physics, Gakushuin University, Toshima, Tokyo 171-8588, Japan
Received January 16, 2017; Accepted July 4, 2017; Published August 10, 2017

We develop a physical model to describe the signal transmission for a continuous-variable quantum key distribution scheme and investigate its security against a couple of eavesdropping attacks assuming that the eavesdropper’s power is partly restricted owing to today’s technological limitations. We consider an eavesdropper performing quantum optical homodyne measurement on the signal obtained by a type of beamsplitting attack. We also consider the case in which the eavesdropper Eve is unable to access a quantum memory and she performs heterodyne measurement on her signal without performing a delayed measurement. Our formulation includes a model in which the receiver’s loss and noise are unaccessible by the eavesdropper. This setup enables us to investigate the condition that Eve uses a practical fiber differently from the usual beamsplitting attack where she can deploy a lossless transmission channel. The secret key rates are calculated in both the direct and reverse reconciliation scenarios.

©2017 The Physical Society of Japan
https://doi.org/10.7566/JPSJ.86.094001

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