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Chin. Phys. B, 2018, Vol. 27(1): 010305    DOI: 10.1088/1674-1056/27/1/010305
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Improved quantum randomness amplification with finite number of untrusted devices based on a novel extractor

Ming-Feng Xu(徐明峰), Wei Pan(潘炜), Lian-Shan Yan(闫连山), Bin Luo(罗斌), Xi-Hua Zou(邹喜华), Peng-Hua Mu(穆鹏华), Li-Yue Zhang(张力月)
Center for Information Photonics and Communications, Southwest Jiaotong University, Chengdu 611756, China
Abstract  Quantum randomness amplification protocols have increasingly attracted attention for their fantastic ability to amplify weak randomness to almost ideal randomness by utilizing quantum systems. Recently, a realistic noise-tolerant randomness amplification protocol using a finite number of untrusted devices was proposed. The protocol has the composable security against non-signalling eavesdroppers and could produce a single bit of randomness from weak randomness sources, which is certified by the violation of certain Bell inequalities. However, the protocol has a non-ignorable limitation on the min-entropy of independent sources. In this paper, we further develop the randomness amplification method and present a novel quantum randomness amplification protocol based on an explicit non-malleable two independent-source randomness extractor, which could remarkably reduce the above-mentioned specific limitation. Moreover, the composable security of our improved protocol is also proposed. Our results could significantly expand the application range for practical quantum randomness amplification, and provide a new insight on the practical design method for randomness extraction.
Keywords:  quantum random number generation      quantum randomness amplification      quantum key distribution  
Received:  21 August 2017      Revised:  07 October 2017      Published:  05 January 2018
PACS:  03.67.-a (Quantum information)  
  03.67.Hk (Quantum communication)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61775185).
Corresponding Authors:  Ming-Feng Xu     E-mail:

Cite this article: 

Ming-Feng Xu(徐明峰), Wei Pan(潘炜), Lian-Shan Yan(闫连山), Bin Luo(罗斌), Xi-Hua Zou(邹喜华), Peng-Hua Mu(穆鹏华), Li-Yue Zhang(张力月) Improved quantum randomness amplification with finite number of untrusted devices based on a novel extractor 2018 Chin. Phys. B 27 010305

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