Performance analysis of free-space quantum key distribution using multiple spatial modes
AffiliationJames C. Wyant College of Optical Sciences, University of Arizona
Department of Electrical Engineering, University of Arizona
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PublisherThe Optical Society
CitationHe, W., Guha, S., Shapiro, J. H., & Bash, B. A. (2021). Performance analysis of free-space quantum key distribution using multiple spatial modes. Optics Express, 29(13), 19305–19318.
RightsCopyright © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at email@example.com.
AbstractIn the diffraction-limited near-field propagation regime, free-space optical quantum key distribution (QKD) systems can employ multiple spatial modes to improve their key rate. This improvement can be effected by means of high-dimensional QKD or by spatial-mode multiplexing of independent QKD channels, with the latter, in general, offering higher key rates. Here, we theoretically analyze spatial-mode-multiplexed, decoy-state BB84 whose transmitter mode set is either a collection of phase-tilted, flat-top focused beams (FBs) or the Laguerre-Gaussian (LG) modes. Although for vacuum propagation the FBs suffer a QKD rate penalty relative to the LG modes, their potential ease of implementation make them an attractive alternative. Moreover, in the presence of turbulence, the FB modes may outperform the LG modes. © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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