Controlling excess noise in fiber optics continuous variables quantum key distribution

Details Controlling excess noise in fiber optics continuous variables quantum key distribution Controlling excess noise in fiber optics continuous variables quantum key distribution

2005-11-10

arxiv.org/abs/quant-ph/0511104v2

PRA, 72, 050303(R) (2005)

Physics

Quantum Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevA.72.050303

We describe a continuous variables coherent states quantum key distribution system working at 1550 nm, and entirely made of standard fiber optics and telecom components, such as integrated-optics modulators, couplers and fast InGaAs photodiodes. The setup is composed of an emitter randomly modulating a coherent state in the complex plane with a doubly Gaussian distribution, and a receiver based on a shot noise limited time-resolved homodyne detector. By using a reverse reconciliation protocol, the device can transfer a raw key rate up to 1 Mb/s, with a proven security against Gaussian or non-Gaussian attacks. The dependence of the secret information rate of the present fiber set-up is studied as a function of the line transmission and excess noise.

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