Floodlight quantum key distribution: A practical route to gigabit-per-second secret-key rates
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PhysRevA.94.012322.pdf
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Author(s)
Zhuang, Quntao
Zhang, Zheshen
Dove, Justin Michael
Wong, Franco N. C.
Shapiro, Jeffrey H
Date Issued
July 2016
Journal
Physical Review A
Publisher
American Physical Society
Citation
Zhuang, Quntao et al. "Floodlight quantum key distribution: A practical route to gigabit-per-second secret-key rates." Physical Review A 94, 1 (July 2016): 012322 © 2016 American Physical Society
Version
Final published version
Abstract
The channel loss incurred in long-distance transmission places a significant burden on quantum key distribution (QKD) systems: they must defeat a passive eavesdropper who detects all the light lost in the quantum channel and does so without disturbing the light that reaches the intended destination. The current QKD implementation with the highest long-distance secret-key rate meets this challenge by transmitting no more than one photon per bit [M. Lucamarini et al., Opt. Express 21, 24550 (2013)OPEXFF1094-408710.1364/OE.21.024550]. As a result, it cannot achieve the Gbps secret-key rate needed for one-time pad encryption of large data files unless an impractically large amount of multiplexing is employed. We introduce floodlight QKD (FL-QKD), which floods the quantum channel with a high number of photons per bit distributed over a much greater number of optical modes. FL-QKD offers security against the optimum frequency-domain collective attack by transmitting less than one photon per mode and using photon-coincidence channel monitoring, and it is completely immune to passive eavesdropping. More importantly, FL-QKD is capable of a 2-Gbps secret-key rate over a 50-km fiber link, without any multiplexing, using available equipment, i.e., no new technology need be developed. FL-QKD achieves this extraordinary secret-key rate by virtue of its unprecedented secret-key efficiency, in bits per channel use, which exceeds those of state-of-the-art systems by two orders of magnitude.
MIT Department
Massachusetts Institute of Technology. Research Laboratory of Electronics
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevA.94.012322
