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Proceedings Paper

Quantum cryptography at 830nm in standard telecommunications fiber
Author(s): Bryan Jacobs; Scott Hendrickson; Michael Dennis; James Franson
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Paper Abstract

Quantum cryptography systems can operate over relatively long distances in standard telecommunications fiber by taking advantage of the low transmission losses in these fibers at 1.3 or 1.5 microns. Although there has been much progress toward the development of highly efficient and low-noise detectors for these wavelengths, silicon avalanche photodiodes currently offer superior single photon counting performance, but only at visible and near IR wavelengths where the fiber transmission is poor. For ranges typical of local area networks, it is possible that a quantum key distribution (QKD) system operating below 850nm could be optimal, even though standard telecommunications fiber supports multiple optical modes at these wavelengths. We have recently developed an optical mode filter that allows efficient higher order mode rejection from standard telecommunications fiber near 830nm. We have used this type of filter to launch and recover QKD signals from a polarization-based system implementing the BB84 quantum cryptography protocol. Here we present results from testing and operation in installed fiber links ranging up to 3km. These results demonstrate that the filters can attenuate the higher order modes over 35dB while having a minimal (<1dB) impact on the fundamental mode carrying the QKD signal.

Paper Details

Date Published: 12 May 2006
PDF: 11 pages
Proc. SPIE 6244, Quantum Information and Computation IV, 62440H (12 May 2006); doi: 10.1117/12.665872
Show Author Affiliations
Bryan Jacobs, Johns Hopkins Univ. (United States)
Scott Hendrickson, Johns Hopkins Univ. (United States)
Michael Dennis, Johns Hopkins Univ. (United States)
James Franson, Johns Hopkins Univ. (United States)

Published in SPIE Proceedings Vol. 6244:
Quantum Information and Computation IV
Eric J. Donkor; Andrew R. Pirich; Howard E. Brandt, Editor(s)

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