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Improvement of continuous-variable quantum key distribution systems by using optical preamplifiers

Abstract : Continuous-variable quantum key distribution protocols, based on Gaussian modulation of the quadratures of coherent states, have been implemented in recent experiments. A present limitation of such systems is the finite efficiency of the detectors, which can in principle be compensated for by the use of classical optical preamplifiers. Here we study this possibility in detail, by deriving the modified secret key generation rates when an optical parametric amplifier is placed at the output of the quantum channel. After presenting a general set of security proofs, we show that the use of preamplifiers does compensate for all the imperfections of the detectors when the amplifier is optimal in terms of gain and noise. Imperfect amplifiers can also enhance the system performance, under conditions which are generally satisfied in practice.
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https://hal-iogs.archives-ouvertes.fr/hal-00553544
Contributor : Philippe Grangier <>
Submitted on : Friday, January 7, 2011 - 3:20:41 PM
Last modification on : Wednesday, September 16, 2020 - 5:43:40 PM

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  • HAL Id : hal-00553544, version 1
  • ARXIV : 0812.4314

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Simon Fossier, Eleni Diamanti, Thierry Debuisschert, Rosa Tualle-Brouri, Philippe Grangier. Improvement of continuous-variable quantum key distribution systems by using optical preamplifiers. Journal of Physics B: Atomic, Molecular and Optical Physics, IOP Publishing, 2009, 42, pp.114014. ⟨hal-00553544⟩

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