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

By S. Fossier, Eleni Diamanti, T. Debuisschert, Rosa Tualle-Brouri, Philippe Grangier. 2008

222 citations recorded by the source corpus.

Continuous-variable quantum key distribution protocols have been implemented recently, based on Gaussian modulation of the quadratures of coherent states. A present limitation of such systems is the finite efficiency of the detectors, that 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 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.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics, Computer Networks and Communications

View Paper: https://www.semanticscholar.org/paper/bc1bcd12998be8437579cf7a95a8390576f65b5b

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In Artificial Intelligence

In Atomic and Molecular Physics, and Optics

In Computer Networks and Communications

Patrick J. Coles

Citations in the corpus

Self-referenced continuous-variable quantum key distribution protocol (2015, background): “Some works [9, 20, 24, 25] use a more nuanced model which assumes that Eve cannot beneﬁt from the noise added by Bob’s detector, therefore resulting in a more optimistic key rate estimate.”