Quantum key distribution over 122 km of standard telecom fiber

By C. Gobby, Zhiliang Yuan, Andrew J. Shields. 2004

623 citations recorded by the source corpus.

We report a demonstration of quantum key distribution over a standard telecom fiber exceeding 100 km in length. Through careful optimization of the interferometer and single photon detector, we achieve a quantum bit error ratio of 8.9% for a 122 km link, allowing a secure shared key to be formed after error correction and privacy amplification. Key formation rates of up to 1.9 kbit/s are achieved depending upon fiber length. We discuss the factors limiting the maximum fiber length in quantum cryptography.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/0c01e5fe4fc65c34ca8021a8837d00ca277aa6db

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In Artificial Intelligence

In Atomic and Molecular Physics, and Optics

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Citations in the corpus

Single-photon generation and detection (2009, background): “each pulse follows Poissonian statistics [21], that is to say the”
Superconducting nanowire single-photon detectors: physics and applications (2012, background): “This demonstration exceeded 200 km transmission range for the first time, and record bit rates were achieved at shorter distances—a significant improvement on the best QKD results achieved at that time with InGaAs SPADs [103].”
High rate, long-distance quantum key distribution over 250 km of ultra low loss fibres (2009, background): “Despite important progress in recent years [ 3-8 ], QKD’s primary challenge is still to achieve higher bit rates over longer distances.”
Practical decoy state for quantum key distribution (15 pages) (2005, background): “In conclusion, decoy state quantum key distribution is highly practical.”
Single-photon detectors for optical quantum information applications (2009, neutral): “55).”
Compact Cavity-Enhanced Single-Photon Generation with Hexagonal Boron Nitride (2019, methodology): “[51] C.”
Experimental quantum key distribution with decoy states. (2005, methodology): “years have now passed and people have extended this distance to 150km of Telecom fibers[3, 4 ].”