Quantum key distribution using a triggered quantum dot source emitting near 1.3μm

  title={Quantum key distribution using a triggered quantum dot source emitting near 1.3$\mu$m},
  author={P. M. Intallura and Martin Ward and O. Z. Karimov and Z. L. Yuan and Patrick See and Andrew J. Shields and Paola Atkinson and D. A. Ritchie Toshiba Research Europe Limited and Cambridge and UK. and Cavendish Laboratory and University of Cambridge},
  journal={Applied Physics Letters},
We report the distribution of a cryptographic key, secure from photon number splitting attacks, over 35km of optical fiber using single photons from an InAs quantum dot emitting ∼1.3μm in a pillar microcavity. Using below GaAs-bandgap optical excitation, we demonstrate suppression of multiphoton emission to 10% of the Poissonian level without detector dark count subtraction. The source is incorporated into a phase encoded interferometric scheme implementing the BB84 protocol for key… 

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