Long-distance continuous-variable quantum key distribution with a Gaussian modulation

Journal Article · Thu Dec 15 00:00:00 EST 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.84.062317· OSTI ID:22095577

Jouguet, Paul ^[1]; Kunz-Jacques, Sebastien ^[2]; Leverrier, Anthony ^[3]

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1. Institut Telecom / Telecom ParisTech, CNRS LTCI, 46, rue Barrault, F-75634 Paris Cedex 13 (France)
2. SeQureNet, 23 avenue d'Italie, F-75013 Paris (France)
3. ICFO-Institut de Ciencies Fotoniques, E-08860 Castelldefels (Barcelona) (Spain)

We designed high-efficiency error correcting codes allowing us to extract an errorless secret key in a continuous-variable quantum key distribution (CVQKD) protocol using a Gaussian modulation of coherent states and a homodyne detection. These codes are available for a wide range of signal-to-noise ratios on an additive white Gaussian noise channel with a binary modulation and can be combined with a multidimensional reconciliation method proven secure against arbitrary collective attacks. This improved reconciliation procedure considerably extends the secure range of a CVQKD with a Gaussian modulation, giving a secret key rate of about 10{sup -3} bit per pulse at a distance of 120 km for reasonable physical parameters.

• OSTI ID: 22095577
• Journal Information: Physical Review. A, Vol. 84, Issue 6; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANNIHILATION OPERATORS
DETECTION
EFFICIENCY
EIGENSTATES
ERRORS
MODULATION
NOISE
PULSES
QUANTUM CRYPTOGRAPHY
QUANTUM MECHANICS
QUBITS
SIGNAL-TO-NOISE RATIO