Controlling excess noise in fiber-optics continuous-variable quantum key distribution

Journal Article · Tue Nov 15 00:00:00 EST 2005 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.72.0· OSTI ID:20786417

Lodewyck, Jerome ^[1]; Debuisschert, Thierry ^[1]; Tualle-Brouri, Rosa; Grangier, Philippe ^[2]

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1. Thales Research and Technologies, RD 128 91767 Palaiseau CEDEX (France)
2. Laboratoire Charles Fabry de l'Institut d'Optique, Campus Universitaire, Batiment 503 91403 Orsay CEDEX (France)

We describe a continuous-variable coherent-states quantum-key distribution system working at 1550 nm, and entirely made of standard fiber optics and telecommunications 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 Mbit/s, with a proven security against Gaussian or non-Gaussian attacks. The dependence of the secret information rate of the present fiber setup is studied as a function of the line transmission and excess noise.

• OSTI ID: 20786417
• Journal Information: Physical Review. A, Vol. 72, Issue 5; Other Information: DOI: 10.1103/PhysRevA.72.050303; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ANNIHILATION OPERATORS
DATA TRANSMISSION
DISTRIBUTION
EIGENSTATES
FIBER OPTICS
GAUSS FUNCTION
INFORMATION THEORY
NOISE
OPTICAL FIBERS
PHOTODIODES
QUANTUM CRYPTOGRAPHY
SECRECY PROTECTION
TIME RESOLUTION