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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 22 — Nov. 4, 2013
  • pp: 27260–27268

Entanglement-based quantum key distribution with biased basis choice via free space

Yuan Cao, Hao Liang, Juan Yin, Hai-Lin Yong, Fei Zhou, Yu-Ping Wu, Ji-Gang Ren, Yu-Huai Li, Ge-Sheng Pan, Tao Yang, Xiongfeng Ma, Cheng-Zhi Peng, and Jian-Wei Pan  »View Author Affiliations

Optics Express, Vol. 21, Issue 22, pp. 27260-27268 (2013)

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We report a free-space entanglement-based quantum key distribution experiment, implementing the biased basis protocol between two sites which are 15.3 km apart. Photon pairs from a polarization-entangled source are distributed through two 7.8-km free-space optical links. An optimal bias 20:80 between the X and Z basis is used. A post-processing scheme with finite-key analysis is applied to extract the final secure key. After three-hour continuous operation at night, a 4293-bit secure key is obtained, with a final key rate of 0.124 bit per raw key bit which increases the final key rate by 14.8% comparing to the standard BB84 case. Our results experimentally demonstrate that the efficient BB84 protocol, which increases key generation efficiency by biasing Alice and Bob’s basis choices, is potentially useful for the ground-satellite quantum communication.

© 2013 OSA

OCIS Codes
(270.0270) Quantum optics : Quantum optics
(270.5565) Quantum optics : Quantum communications
(270.5585) Quantum optics : Quantum information and processing

ToC Category:
Quantum Optics

Original Manuscript: September 30, 2013
Revised Manuscript: October 21, 2013
Manuscript Accepted: October 24, 2013
Published: November 1, 2013

Yuan Cao, Hao Liang, Juan Yin, Hai-Lin Yong, Fei Zhou, Yu-Ping Wu, Ji-Gang Ren, Yu-Huai Li, Ge-Sheng Pan, Tao Yang, Xiongfeng Ma, Cheng-Zhi Peng, and Jian-Wei Pan, "Entanglement-based quantum key distribution with biased basis choice via free space," Opt. Express 21, 27260-27268 (2013)

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