Floodlight quantum key distribution: Demonstrating a framework for high-rate secure communication
Name
PhysRevA.95.012332.pdf
Size
1.14 MB
Format
Adobe PDF
Checksum (MD5)
542a1a84b963139a8b9f0e0783128c96
Author(s)
Zhang, Zheshen
Zhuang, Quntao
Shapiro, Jeffrey H
Wong, Ngai Chuen
Date Issued
January 2017
Journal
Physical Review A
Publisher
American Physical Society
Citation
Zhang, Zheshen et al. “Floodlight Quantum Key Distribution: Demonstrating a Framework for High-Rate Secure Communication.” Physical Review A 95.1 (2017): n. pag. © 2017 American Physical Society
Version
Final published version
Abstract
Floodlight quantum key distribution (FL-QKD) is a radically different QKD paradigm that can achieve gigabit-per-second secret-key rates over metropolitan area distances without multiplexing [Q. Zhuang et al., Phys. Rev. A 94, 012322 (2016)]. It is a two-way protocol that transmits many photons per bit duration and employs a high-gain optical amplifier, neither of which can be utilized by existing QKD protocols, to mitigate channel loss. FL-QKD uses an optical bandwidth that is substantially larger than the modulation rate and performs decoding with a unique broadband homodyne receiver. Essential to FL-QKD is Alice's injection of photons from a photon-pair source—in addition to the light used for key generation—into the light she sends to Bob. This injection enables Alice and Bob to quantify Eve's intrusion and thus secure FL-QKD against collective attacks. Our proof-of-concept experiment included 10 dB propagation loss—equivalent to 50 km of low-loss fiber—and achieved a 55 Mbit/s secret-key rate (SKR) for a 100 Mbit/s modulation rate, as compared to the state-of-the-art system's 1 Mbit/s SKR for a 1 Gbit/s modulation rate [M. Lucamarini et al., Opt. Express 21, 24550 (2013)], representing ∼500-fold and ∼50 fold improvements in secret-key efficiency (bits per channel use) and SKR (bits per second), respectively.
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.95.012332
