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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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| Cite this article: |
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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.
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| Keywords:
42.65.Lm
07.90.+c
03.67.-a
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Published: 01 October 2004
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| PACS: |
42.65.Lm
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(Parametric down conversion and production of entangled photons)
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07.90.+c
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(Other topics in instruments, apparatus, and components common to several branches of physics and astronomy)
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03.67.-a
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(Quantum information)
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