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Abstract: Practical realizations of quantum key distribution employ dim coherent states as an approximation to single photon states. The advantage is that dim coherent states are convenient to use. The draw-back is that the security proofs for quantum key distribution have to be adapted. Difficulties arising from the use of signal states containing multi-photon contributions in combination with lossy channels have been pointed out earlier by Huttner et al.. In this paper I describe a first numerical... (Update)
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BibTeX entry: (Update)
@misc{ lutkenhaus-dim,
author = "Norbert L{\"u}tkenhaus",
title = "Dim Coherent States As Signal States In The {BB84} Protocol: Is It Secure?",
url = "citeseer.ist.psu.edu/107118.html" }
Citations (may not include all citations):90 Quantum cryptography: Public key distribution and coin tossi.. (context) - Bennett, Brassard - 1984
18 Linking information reconciliation and privacy amplication - Cachin, Maurer - 1997
11 Secret-key reconciliation by public discussion - Brassard, Salvail - 1993
5 Quantum cryptography (context) - Hughes, Alde et al. - 1995
4 Quantum cryptography with coherent states (context) - Huttner, Imoto et al. - 1995
3 Quantum cryptography - how to beat the code breakers using q.. (context) - Phoenix, Townsend - 1995
1 Security of quantum key distribution (context) - Lo, Chau - 1998
1 Estimates for practical quantum cryptography (context) - utkenhaus - 1998
Documents on the same site (http://www.physics.helsinki.fi/~lutkenha/):
Security of Quantum Cryptography with Realistic Sources - Lütkenhaus (1999) (Correct)
Quantum Key Distribution: Theory for Application - Lütkenhaus (1999) (Correct)
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