High-order encoding schemes for floodlight quantum key distribution
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PhysRevA.98.012323.pdf
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847.79 KB
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Author(s)
Zhuang, Quntao
Zhang, Zheshen
Shapiro, Jeffrey H
Date Issued
July 2018
Journal
Physical Review A
Publisher
American Physical Society
Citation
Zhuang, Quntao et al. "High-order encoding schemes for floodlight quantum key distribution." Physical Review A 98, 1 (July 2018): 012323 © 2018 American Physical Society
Version
Final published version
Abstract
Floodlight quantum key distribution (FL-QKD) has realized a 1.3 Gbit/s secret-key rate (SKR) over a 10-dB-loss channel against a frequency-domain collective attack [Quantum Sci. Technol. 3, 025007 (2018)2058-956510.1088/2058-9565/aab623]. It achieved this remarkable SKR by means of binary phase-shift keying (BPSK) of multiple optical modes. Moreover, it did so with available technology, and without space-division or wavelength-division multiplexing. In this paper we explore whether replacing FL-QKD's BPSK modulation with a high-order encoding can further increase that protocol's SKR. First, we show that going to K-ary phase-shift keying with K=32 doubles—from 2.0 to 4.5 Gbit/s—the theoretical prediction from [Phys. Rev. A 94, 012322 (2016)2469-992610.1103/PhysRevA.94.012322] for FL-QKD's BPSK SKR on a 50-km-long fiber link. Second, we show that 2d×2d quadrature amplitude modulation does not offer any SKR improvement beyond what its d=1 case—which is equivalent to quadrature phase-shift keying—provides.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Research Laboratory of Electronics
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DOI of Published Version
https://doi.org/10.1103/PhysRevA.98.012323
