Simple and Efficient Quantum Key Distribution with Parametric Down-Conversion

Yoritoshi Adachi, Takashi Yamamoto, Masato Koashi, and Nobuyuki Imoto
Phys. Rev. Lett. 99, 180503 – Published 2 November 2007

Abstract

We propose an efficient quantum key distribution protocol based on the photon-pair generation from parametric down-conversion (PDC). It uses the same experimental setup as the conventional protocol, but a refined data analysis enables detection of photon-number splitting attacks by utilizing information from a built-in decoy state. Assuming the use of practical detectors, we analyze the unconditional security of the new scheme and show that it improves the secure key generation rate by several orders of magnitude at long distances, using a high intensity PDC source.

  • Figure
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  • Received 15 October 2006

DOI:https://doi.org/10.1103/PhysRevLett.99.180503

©2007 American Physical Society

Authors & Affiliations

Yoritoshi Adachi*, Takashi Yamamoto, Masato Koashi, and Nobuyuki Imoto

  • Division of Materials Physics, Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
  • CREST Research Team for Photonic Quantum Information, 4-1-8 Honmachi, Kawaguchi, Saitama 331-0012, Japan

  • *adachi@qi.mp.es.osaka-u.ac.jp

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Issue

Vol. 99, Iss. 18 — 2 November 2007

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