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Abstract: We report the distribution of a cryptographic key, secure from photon numbersplitting attacks, over 35 km of optical fiber using single photons from anInAs quantum dot emitting ~1.3 microns in a pillar microcavity. Using belowGaAs-bandgap optical excitation, we demonstrate suppression of multiphotonemission to 10% of the Poissonian level without detector dark countsubtraction. The source is incorporated into a phase encoded interferometricscheme implementing the BB84 protocol for key distribution over standardtelecommunication optical fiber. We show a transmission distance advantage overthat possible with length-optimized uniform intensity weak coherent pulses at1310 nm in the same system.



Autor: P. M. Intallura 1 and 2, M. B. Ward 1, O. Z. Karimov 1, Z. L. Yuan 1, P. See 1, A. J. Shields 1, P. Atkinson 2, D. A. Ritchie 2 1

Fuente: https://arxiv.org/







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