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DOI 10.1103/PhysRevA.72.032301
Title Security of two quantum cryptography protocols using the same four qubit states
Creator/Author Branciard, Cyril [Group of Applied Physics, University of Geneva, 20, rue de l'Ecole-de-Medecine, 1211 Geneva 4 (Switzerland) ; Ecole Nationale Superieure des Telecommunications, 46, rue Barrault, 75013 Paris (France)] ; Gisin, Nicolas ; Kraus, Barbara ; Scarani, Valerio [Group of Applied Physics, University of Geneva, 20, rue de l'Ecole-de-Medecine, 1211 Geneva 4 (Switzerland)]
Publication Date2005 Sep 15
OSTI IdentifierOSTI ID: 20718487
Other Number(s)Journal ID: ISSN 1050-2947; PLRAAN; TRN: US06A2853030750
Resource TypeJournal Article
Resource RelationJournal Name: Physical Review. A; Journal Volume: 72; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevA.72.032301; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Subject74 ATOMIC AND MOLECULAR PHYSICS; DATA TRANSMISSION; DISTANCE; ERRORS; IMPLEMENTATION; OPTICS; PHOTONS; PULSES; QUANTUM COMPUTERS; QUANTUM CRYPTOGRAPHY; QUBITS; SECRECY PROTECTION
Description/AbstractThe first quantum cryptography protocol, proposed by Bennett and Brassard in 1984 (BB84), has been widely studied in recent years. This protocol uses four states (more precisely, two complementary bases) for the encoding of the classical bit. Recently, it has been noticed that by using the same four states, but a different encoding of information, one can define a protocol which is more robust in practical implementations, specifically when attenuated laser pulses are used instead of single-photon sources [V. Scarani et al., Phys. Rev. Lett. 92, 057901 (2004), referred to as the SARG04 protocol]. We present a detailed study of SARG04 in two different regimes. In the first part, we consider an implementation with a single-photon source: we derive bounds on the error rate Q for security against all possible attacks by the eavesdropper. The lower and the upper bound obtained for SARG04 (Q < or approx. 10.95% and Q > or approx. 14.9%, respectively) are close to those obtained for BB84 (Q < or approx. 12.4% and Q > or approx. 14.6%, respectively). In the second part, we consider a realistic source consisting of an attenuated laser and improve on previous analysis by allowing Alice to optimize the mean number of photons as a function of the distance. The SARG04 protocol is found to perform better than BB84, both in secret-key rate and in maximal achievable distance, for a wide class of Eve's attacks.
Country of PublicationUnited States
LanguageEnglish
FormatMedium: X; Size: page(s) 032301-032301.18
System Entry Date2008 Feb 09

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