Continuous-variable quantum key distribution with noisy coherent states

Journal Article · Fri Feb 15 00:00:00 EST 2008 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.77.022310· OSTI ID:21140455

Filip, Radim ^[1]

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1. Department of Optics, Palacky University, 17 listopadu 50, 772 07 Olomouc (Czech Republic)

An excess noise in coherent-state preparation can prevent secure key distribution through lossy channel. The feasible single-copy and multicopy linear optical methods are proposed to purify the prepared state. The single-copy method always sufficiently reduces the excess noise to obtain the key secure against both the individual and collective attacks even through any lossy channel. To increase the secure key rate, two feasible applications of the multicopy linear optical purification are proposed. As a result, maximal secure key rate achievable through a given lossy channel can be approached.

• OSTI ID: 21140455
• Journal Information: Physical Review. A, Vol. 77, Issue 2; Other Information: DOI: 10.1103/PhysRevA.77.022310; (c) 2008 The American Physical Society; 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
DISTRIBUTION
EIGENSTATES
NOISE
OPTICS
PURIFICATION
QUANTUM CRYPTOGRAPHY
QUANTUM INFORMATION
QUANTUM MECHANICS
SECURITY