Quantum key distribution over 25 km with an all-fiber continuous-variable system

By J. Lodewyck, Matthieu R. Bloch, Raul Garcia-Patron, S. Fossier, E. Karpov, Eleni Diamanti, T. Debuisschert, Nicolas J. Cerf, Rosa Tualle-Brouri, Steven W. McLaughlin and 1 more. 2007

447 citations recorded by the source corpus.

We report on the implementation of a reverse-reconciliated coherent-state continuous-variable quantum key distribution system, with which we generated secret keys at a rate of more than 2 kb/s over 25 km of optical fiber. Time multiplexing is used to transmit both the signal and phase reference in the same optical fiber. Our system includes all experimental aspects required for a field implementation of a quantum key distribution setup. Real-time reverse reconciliation is achieved by using fast and efficient low-density parity check error correcting codes.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/033e0dd43b7d733a5d56ac57eee587292e56b38f

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In Atomic and Molecular Physics, and Optics

Citations in the corpus

Information-Theoretically Secret Key Generation for Fading Wireless Channels (2009, background): “Quantum key distribution schemes based on continuous random variables have been discussed in [28], [55], [13], [36].”
Continuous-variable optical quantum-state tomography (2009, background): “Time-domain homodyning is also an essential element of continuous-variable quantum cryptography Grosshans and Grander, 2002; Silberhorn et al., 2002; Funk, 2004; Lodewyck et al., 2007 .”
Continuous‐Variable Quantum Key Distribution with Gaussian Modulation—The Theory of Practical Implementations (2017, methodology): “It is easy to show that this representation of the covariance matrix under loose assumptions is equivalent to the one often used in CV-QKD literature [18]:”
Long-distance continuous-variable quantum key distribution by controlling excess noise (2016, background): “Because of the difficulty of reconciliation at low signal-to-noise ratios (SNRs) in previous 25 km experiments 15–19 , P. Jouguet et al. developed an efficient error-correcting code (ECC) 20 which leads to a remarkable improvement of transmission distance for CV-QKD 21 .”
Self-referenced continuous-variable quantum key distribution protocol (2015, background): “Another complication associated with the requirement of LO transmission is that a relative phase shift arises between the signal and LO due to the path separation during demulti-plexing at the receiver [16, 20].”
Fundamental rate-loss tradeoff for optical quantum key distribution (2014, background): “The Holevo information for such a scenario is for example given in [6].”
Advances in quantum cryptography (2019, unknown): “[471] J.”