High-order encoding schemes for floodlight quantum key distribution
AffiliationUniv Arizona, Dept Mat Sci & Engn
MetadataShow full item record
PublisherAMER PHYSICAL SOC
CitationZhuang, Quntao & Zhang, Zheshen & Shapiro, Jeffrey. (2018). High-order encoding schemes for floodlight quantum key distribution. Physical Review A. 98. 10.1103/PhysRevA.98.012323.
JournalPHYSICAL REVIEW A
Rights©2018 American Physical Society
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 firstname.lastname@example.org.
AbstractFloodlight 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)]. 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 doublesfrom 2.0 to 4.5 Gbit/sthe theoretical prediction from [Phys. Rev. A 94, 012322 (2016)] for FL-QKD's BPSK SKR on a 50-km-long fiber link. Second, we show that 2d x 2d quadrature amplitude modulation does not offer any SKR improvement beyond what its d = 1 casewhich is equivalent to quadrature phase-shift keyingprovides.
VersionFinal published version
SponsorsAir Force Office of Scientific Research (AFOSR) MURI program [FA9550-14-1-0052]; Office of Naval Research (ONR) [N00014-16-C-2069]; Claude E. Shannon Research Assistantship