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

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

doi:10.1126/sciadv.1701491

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

Journal Article · 24 November 2017 · Science Advances

DOI: https://doi.org/10.1126/sciadv.1701491 · OSTI ID:1410948

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Duke Univ., Durham, NC (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); National Univ. of Singapore (Singapore)
Duke Univ., Durham, NC (United States); IonQ Inc., College Park, MD (United States)
The Ohio State Univ., Columbus, OH (United States)

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. In conclusion, 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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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1410948

Journal Information:: Science Advances, Vol. 3, Issue 11; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 163 works

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