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Title: Improving the maximum transmission distance of continuous-variable quantum key distribution using a noiseless amplifier

We show that the maximum transmission distance of continuous-variable quantum key distribution in presence of a Gaussian noisy lossy channel can be arbitrarily increased using a heralded noiseless linear amplifier. We explicitly consider a protocol using amplitude and phase modulated coherent states with reverse reconciliation. Assuming that the secret key rate drops to zero for a line transmittance T{sub lim}, we find that a noiseless amplifier with amplitude gain g can improve this value to T{sub lim}/g{sup 2}, corresponding to an increase in distance proportional to log g. We also show that the tolerance against noise is increased.
Authors:
; ;  [1] ;  [2] ;  [3] ;  [4]
  1. Laboratoire Charles Fabry, Institut d'Optique, CNRS, Université Paris-Sud, 2 avenue Augustin Fresnel, 91127 Palaiseau Cedex (France)
  2. Institute for Theoretical Physics, ETH Zurich, 8093 Zurich, Switzerland and INRIA Paris-Rocquencourt, 78153 Le Chesnay Cedex (France)
  3. Laboratoire Charles Fabry, Institut d'Optique, CNRS, Université Paris-Sud, 2 avenue Augustin Fresnel, 91127 Palaiseau Cedex, France and Clarendon Laboratory, Department of Physics, University of Oxford, OX1 3PU (United Kingdom)
  4. Laboratoire Charles Fabry, Institut d'Optique, CNRS, Université Paris-Sud, 2 avenue Augustin Fresnel, 91127 Palaiseau Cedex, France and Institut Universitaire de France, 103 boulevard St. Michel, 75005, Paris (France)
Publication Date:
OSTI Identifier:
22390662
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1633; Journal Issue: 1; Conference: 11. International Conference on Quantum Communication, Measurement and Computation, Vienna (Austria), 30 Jul - 3 Aug 2012; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AMPLIFIERS; AMPLITUDES; ANNIHILATION OPERATORS; DISTANCE; EIGENSTATES; GAUSS FUNCTION; MODULATION; NOISE; TOLERANCE