Quantum crytography over 14km of installed optical fiber

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We have made the first demonstration that low error rate quantum cryptography over long distances (14km) of installed optical fiber in a real-world environment, subject to uncontrolled temperature and mechanical influences, representing an important new step towards incorporation of quantum cryptography into existing information security systems. We also point out that the high visibility single-photon interference in our experiment allows us to infer a test of the superposition principle of quantum mechanics: a photon reaching the detector has traveled over 14km of optical fiber in a wavepacket comprising a coherent superposition of two components that are spatially separated by about ... continued below

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10 p.

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Hughes, R.J.; Luther, G.G.; Morgan, G.L. & Simmons, C. September 1, 1995.

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We have made the first demonstration that low error rate quantum cryptography over long distances (14km) of installed optical fiber in a real-world environment, subject to uncontrolled temperature and mechanical influences, representing an important new step towards incorporation of quantum cryptography into existing information security systems. We also point out that the high visibility single-photon interference in our experiment allows us to infer a test of the superposition principle of quantum mechanics: a photon reaching the detector has traveled over 14km of optical fiber in a wavepacket comprising a coherent superposition of two components that are spatially separated by about 2m. In principle, there are decoherence processes (or even possible modifications of quantum mechanics) that could cause the photon`s wavefunction to collapse into one component or the other during propagation, leading to a reduction in visibility. However, our results are consistent with no such loss of quantum coherence during the 67-{mu}s propagation time.

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10 p.

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OSTI as DE96000012

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  • 7. Rochester conference on coherence and quantum optics, Rochester, NY (United States), 7-10 Jun 1995

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  • Other: DE96000012
  • Report No.: LA-UR--95-2836
  • Report No.: CONF-9506238--2
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 110172
  • Archival Resource Key: ark:/67531/metadc622218

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  • September 1, 1995

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • Feb. 26, 2016, 3:51 p.m.

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Hughes, R.J.; Luther, G.G.; Morgan, G.L. & Simmons, C. Quantum crytography over 14km of installed optical fiber, article, September 1, 1995; New Mexico. (digital.library.unt.edu/ark:/67531/metadc622218/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.