Chin. Phys. Lett.  2004, Vol. 21 Issue (10): 1961-1964    DOI:
Original Articles |
A Random Number Generator Based on Quantum Entangled Photon Pairs
MA Hai-Qiang1;WANG Su-Mei1,2;ZHANG Da1;CHANG Jun-Tao1;JI Ling-Ling1;HOU Yan-Xue1;WU Ling-An1
1Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080 2Laboratory of Atomic and Molecular Physics, College of Physics and Electronics,Shandong Normal University, Ji’nan 250014
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MA Hai-Qiang, WANG Su-Mei, ZHANG Da et al  2004 Chin. Phys. Lett. 21 1961-1964
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Abstract A new scheme for a random number generator based on quantum entangled photon pairs is demonstrated. Signal photons produced by optical parametric down-conversion are detected at two single-photon detectors after transmission or reflection at a 50/50% beamsplitter, to form a truly random binary sequence. Their arrival is signalled by their twin idler photons, so that a cw laser source may be used instead of attenuated laser pulses. Coincidence measurement is employed to obtain the bit sequences, which are shown to fully satisfy the standard tests for randomness.

Keywords: 42.65.Lm      07.90.+c      03.67.-a     
Published: 01 October 2004
PACS:  42.65.Lm (Parametric down conversion and production of entangled photons)  
  07.90.+c (Other topics in instruments, apparatus, and components common to several branches of physics and astronomy)  
  03.67.-a (Quantum information)  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2004/V21/I10/01961
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MA Hai-Qiang
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HOU Yan-Xue
WU Ling-An
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