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Islam NT, Lim CCW, Cahall C, et al. Provably secure and high-rate quantum key distribution with time-bin qudits. Sci Adv. 2017;3(11):e1701491doi: 10.1126/sciadv.1701491.
Islam, N. T., Lim, C. C. W., Cahall, C., Kim, J., & Gauthier, D. J. (2017). Provably secure and high-rate quantum key distribution with time-bin qudits. Science advances, 3(11), e1701491. https://doi.org/10.1126/sciadv.1701491
Islam, Nurul T, et al. "Provably secure and high-rate quantum key distribution with time-bin qudits." Science advances vol. 3,11 (2017): e1701491. doi: https://doi.org/10.1126/sciadv.1701491
Islam NT, Lim CCW, Cahall C, Kim J, Gauthier DJ. Provably secure and high-rate quantum key distribution with time-bin qudits. Sci Adv. 2017 Nov 24;3(11):e1701491. doi: 10.1126/sciadv.1701491. eCollection 2017 Nov. PMID: 29202028; PMCID: PMC5706749.
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Sci Adv. 2017 Nov 24;3(11):e1701491. doi: 10.1126/sciadv.1701491. eCollection 2017 Nov.

Provably secure and high-rate quantum key distribution with time-bin qudits.

Science advances

Nurul T Islam, Charles Ci Wen Lim, Clinton Cahall, Jungsang Kim, Daniel J Gauthier

Affiliations

  1. Department of Physics and the Fitzpatrick Institute for Photonics, Duke University, Durham, NC 27708, USA.
  2. Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6418, USA.
  3. Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117583, Singapore.
  4. Department of Electrical Engineering and the Fitzpatrick Institute for Photonics, Duke University, Durham, NC 27708, USA.
  5. IonQ Inc., 4505 Campus Drive, College Park, MD 20730, USA.
  6. Department of Physics, Ohio State University, 191 West Woodruff Avenue, Columbus, OH 43210, USA.

PMID: 29202028 PMCID: PMC5706749 DOI: 10.1126/sciadv.1701491

Abstract

The security of conventional cryptography systems is threatened in the forthcoming era of quantum computers. Quantum key distribution (QKD) features fundamentally proven security and offers a promising option for quantum-proof cryptography solution. Although prototype QKD systems over optical fiber have been demonstrated over the years, the key generation rates remain several orders of magnitude lower than current classical communication systems. In an effort toward a commercially viable QKD system with improved key generation rates, we developed a discrete-variable QKD system based on time-bin quantum photonic states that can generate provably secure cryptographic keys at megabit-per-second rates over metropolitan distances. We use high-dimensional quantum states that transmit more than one secret bit per received photon, alleviating detector saturation effects in the superconducting nanowire single-photon detectors used in our system that feature very high detection efficiency (of more than 70%) and low timing jitter (of less than 40 ps). Our system is constructed using commercial off-the-shelf components, and the adopted protocol can be readily extended to free-space quantum channels. The security analysis adopted to distill the keys ensures that the demonstrated protocol is robust against coherent attacks, finite-size effects, and a broad class of experimental imperfections identified in our system.

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