TY - JOUR
T1 - Floodlight quantum key distribution
T2 - Demonstrating a framework for high-rate secure communication
AU - Zhang, Zheshen
AU - Zhuang, Quntao
AU - Wong, Franco N.C.
AU - Shapiro, Jeffrey H.
N1 - Funding Information:
We thank Q. Zhao and A. McCaughan for valuable discussions about SNSPDs and E. Wong for generating the three-dimensional experimental schematic. This research was funded by ONR Grant No. N00014-13-1-0774, AFOSR Grant No. FA9550-14-1-0052, the DARPA Quiness Program through U.S. Army Research Office Grant No. W31P4Q-12-1-0019, and DURIP instrumentation ONR Grant No. N00014-14-1-0808.
Publisher Copyright:
© 2017 American Physical Society.
PY - 2017/1/26
Y1 - 2017/1/26
N2 - 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, Phys. Rev. A 94, 012322 (2016)2469-992610.1103/PhysRevA.94.012322]. 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, Opt. Express 21, 24550 (2013)OPEXFF1094-408710.1364/OE.21.024550], representing ∼500-fold and ∼50-fold improvements in secret-key efficiency (bits per channel use) and SKR (bits per second), respectively.
AB - 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, Phys. Rev. A 94, 012322 (2016)2469-992610.1103/PhysRevA.94.012322]. 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, Opt. Express 21, 24550 (2013)OPEXFF1094-408710.1364/OE.21.024550], representing ∼500-fold and ∼50-fold improvements in secret-key efficiency (bits per channel use) and SKR (bits per second), respectively.
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U2 - 10.1103/PhysRevA.95.012332
DO - 10.1103/PhysRevA.95.012332
M3 - Article
AN - SCOPUS:85011588643
SN - 2469-9926
VL - 95
JO - Physical Review A
JF - Physical Review A
IS - 1
M1 - 012332
ER -